Android常用代码
Android / houtizong 发布于 3年前 175
转于：http://blog.sina.com.cn/s/blog_6c9d637501013psh.html
----------------------------------------------------------------------------------------------
Android代码速查和常用基本功能实现方法
0 android创建按钮
Button button = new Button(this);
1 android创建输入框
EditText editText = new EditText(this);
2 android创建文本
TextView textView = new TextView(this);
3 android设置文本显示内容
TextView textView = new TextView(this);
textView.setText("hello world!");
4 android设置文本背景色
TextView textView = new TextView(this);
textView.setBackgroundColor(Color.YELLOW);
5 android设置文本颜色
TextView textView = new TextView(this);
textView.setTextColor(Color.YELLOW);
6 android设置文本文字大小
TextView textView = new TextView(this);
textView.setTextSize(18);
7 android设置输入框宽度
EditText editText = new EditText(this);
editText.setWidth(200);
8 android设置输入框为密码框
EditText editText = new EditText(this);
editText.setTransformationMethod(PasswordTransformationMe
thod.getInstance());
9 android设置输入框为密码框（xml配置）
android:password="true"
10 android 提示对话框的使用
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("你好");
builder.setPositiveButton("OK",this);
builder.show();
需实现android.content.DialogInterface.OnClickListener接口
11 android ListView的使用
ListView listView = new ListView(this);
ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String[]{"标题"},new int[]{R.id.TextView01});
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
然后实现OnItemClickListener接口
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {}
12 android更新ListView
ListView listView = new ListView(this);
ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String[]{"标题"},new int[]{R.id.TextView01});
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();//通知更新ListView
13 android创建LinearLayout
LinearLayout layoutParant = new LinearLayout(this);
14 android时间设置对话框的使用
DatePickerDialog dlg = new DatePickerDialog(this,this,year,month,day);
dlg.show();
//year month day 均为int型，第二个参数为this时，该类需要implements OnDateSetListener并重写以下方法
public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {
}
15 android创建FrameLayout
FrameLayout layout = new FrameLayout(this);
16 android触发键盘事件
layout.setOnKeyListener(this);
//需要implements OnKeyListener并重写以下方法
public boolean onKey(View v, int keyCode, KeyEvent event) {
return false;//返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。
}
17 android触发鼠标事件
layout.OnTouchListener(this);
//需要implements OnTouchListener并重写以下方法
public boolean onTouch(View v, MotionEvent event) {
return false;//返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。
}
18 android获得屏幕宽度和高度
int width = this.getWindow().getWindowManager().getDefaultDisplay().getWidth();
int height =this.getWindow().getWindowManager().getDefaultDisplay().getHeight();
19 android布局添加控件
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);
layout.addView(button);
20 android intent实现activit之间跳转
Intent intent = new Intent();
intent.setClass(this, DestActivity.class);
startActivity(intent);
21 android intent设置action
Intent intent = new Intent();
intent.setAction(intent.ACTION_DIAL);
22 android intent设置data
Intent intent = new Intent();
intent.setData(Uri.parse("tel:00000000"));
23 android intent传数据
Intent intent = new Intent();
intent.putExtra("data", value);//value可以是很多种类型，在接收activity中取出后强制转换或调用相应类型的get函数。
24 android intent取数据
String value = (String)getIntent().getExtras().get("data");
//or String value = getIntent().getExtras().getString("data");
25 android利用paint和canvas画图
setContentView(new MyView(this));
class MyView extends View{
public MyView(Context context){
super(context);
}
public void onDraw(Canvas canvas){
Paint paint = new Paint();//创建画笔
paint.setColor(Color.BLUE);//设置画笔颜色
canvas.drawRect(0, 0, 100, 100, paint);//画个正方形，坐标0，0，100，100。
}
}
26 android新建对话框
Dialog dialog = new Dialog(this);
dialog.setTitle("test");//设置标题
dialog.addContentView(button,new LayoutParams(-1,-1));//添加控件,-1是设置高度和宽度充满布局，-2是按照需要设置宽度高度。
dialog.show();
27 android取消对话框
dialog.cancel();
28 android对View类刷新显示
view.invalidate();//通过这个调用view的onDraw()函数
29 android使用SurfaceView画图
setContentView(new MySurfaceView(this));
class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{
SurfaceHolder holder;
public MySurfaceView(Context context) {
super(context);
holder = getHolder();
holder.addCallback(this);
}
class MyThread extends Thread{
public void run(){
Canvas canvas = holder.lockCanvas();
Paint paint = new Paint();
paint.setColor(Color.YELLOW);
canvas.drawRect(100, 100, 200, 200, paint);
holder.unlockCanvasAndPost(canvas);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}
public void surfaceCreated(SurfaceHolder holder) {
new MyThread().start();
}
public void surfaceDestroyed(SurfaceHolder holder) {}
}
30 android获得控件findViewById
TextView textView = (TextView) findViewById(R.id.TextView01);
31 android十六进制设置画笔颜色
Paint paint = new Paint();
paint.setColor(0xffffffff);//第一个ff是透明度的设置。
32 android获得String.xml中配置的字符串,在activity中直接调用
getText(R.string.app_name);
33 android去掉应用程序头部
requestWindowFeature(Window.FEATURE_NO_TITLE);
34 android使用SharedPreferences写入数据代码
getSharedPreferences("data", 0).edit().putString("aa","bb").commit();
35 android使用SharedPreferences读取数据代码
String data = getSharedPreferences("data", 0).getString("item","");//后面的""是默认值，没有取到则赋值为""，如果不想有默认，可以设置null。
36 android继承SQLiteOpenHelper
class MyHelper extends SQLiteOpenHelper{
public MyHelper(Context context, String name, CursorFactory factory,int version) {
super(context, name, factory, version);
}
public void onCreate(SQLiteDatabase db){
db.execSQL("CREATE TABLE IF NOT EXISTS testtable ("
+"cardno integer primary key,"
+"username varchar,"
+ "money integer"
+")");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
db.execSQL("DROP TABLE IF EXISTS testtable");
onCreate(db);
}
}
37 android利用SQLiteOpenHelper打开数据库
MyHelper dbHelper = new MyHelper(this, "testtable.db", null, 1);
SQLiteDatabase db = dbHelper.getReadableDatabase();//打开只读
//或者SQLiteDatabase db = dbHelper.getWritableDatabase();//打开可写
38 android查询数据表并显示结果
Cursor cursor = db.query("testtable", null, null, null, null, null, null);//db的获得请参见“利用SQLiteOpenHelper打开数据库”
while(!cursor.isAfterLast()){
Log.i("test",cursor.getString(0));
cursor.moveToNext();
}
39 android Logcat输出打印测试信息
Log.i("TAG","TEST");
40 android数据表插入数据
ContentValues values = new ContentValues();
values.put("username","admin");
values.put("money","10000");
db.insert("testtable", null, values);
41 android使得应用全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
42 android设置LinearLayout方向为竖
layoutParant.setOrientation(LinearLayout.VERTICAL);
43 android设置LinearLayout方向为横
layoutParant.setOrientation(LinearLayout.HORIZONTAL);
44 android数据库更新数据
ContentValues values = new ContentValues();
values.put("username","admin");
values.put("money","10000");
db.update("testtable",values,"userno=1",null);
45 android数据库删除数据
db.delete("testtable","userno=1",null);
46 android判断sd卡是否存在
if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)){
Log.i("test","SDCARD exists");
}
else{
Log.i("test","SDCARD doesn't exist");
}
47 android创建ImageView
ImageView view = new ImageView(this);
view.setImageResource(R.drawable.icon);
48 android提示信息Toast toast = Toast.makeText(this, "hello", Toast.LENGTH_LONG);
toast.show();
49 android创建单选框以及单选组
RadioButton radioButton = new RadioButton(this);
RadioButton radioButton2 = new RadioButton(this);
radioButton.setText("yes");
radioButton2.setText("no");
RadioGroup radioGroup = new RadioGroup(this);
radioGroup.addView(radioButton);
radioGroup.addView(radioButton2);
50 android新建播放器
MediaPlayer MediaPlayer = new MediaPlayer();
51 android媒体播放器使用
//创建MediaPlayer
MediaPlayer player = new MediaPlayer();
//重置MediaPlayer
player.reset();
try {
//设置要播放的文件的路径
player.setDataSource("/sdcard/1.mp3");
//准备播放
player.prepare();
}catch (Exception e) {
}
//开始播放
player.start();
//设置播放完毕事件
player.setOnCompletionListener(new OnCompletionListener(){
public void onCompletion(MediaPlayer player) {
//播完一首循环
try {
//再次准备播放
player.prepare();
}catch (Exception e) {
}
player.start();
}
});
52 android媒体播放器暂停
player.pause();
53 android清空cookies
CookieManager.getInstance().removeAllCookie();
54 android文本设置粗体
TextView textView = new TextView(this);
TextPaint textPaint = textView.getPaint();
textPaint.setFakeBoldText(true);
55 android网络权限配置
<uses-permission android:name="android.permission.INTERNET" />
56 android GL设定背景色
gl.glClearColor(0.5f, 0.2f, 0.2f, 1.0f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
57 android创建GL画布
public class My3DView extends GLSurfaceView {
private GLSurfaceView.Renderer renderer;
public My3DView(Context context) {
super(context);
renderer = new My3DRender();
setRenderer(renderer);
}
}
58 android创建复选框
CheckBox checkBox = new CheckBox(this);
59 android复选框监听选择/取消事件
checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){
Log.i("QSR","TEST");
}
});
60 android创建菜单
//重写下面这个函数
public boolean onCreateOptionsMenu(Menu menu){
super.onCreateOptionsMenu(menu);
menu.add(0, 1, 1, "test1");
menu.add(0, 2, 2, "test2");
menu.add(0, 3, 3, "test3");
menu.add(0, 4, 4, "test4");
return true;
}
61 android处理菜单选择事件
public boolean onOptionsItemSelected(MenuItem item){
int id = item.getItemId();
switch (id){
case 1:
Log.i("QSR","1");
break;
case 2:
Log.i("QSR","2");
break;
case 3:
Log.i("QSR","3");
break;
case 4:
Log.i("QSR","4");
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
62 android允许程序访问GPS(XML配置)
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
63 android允许程序访问GSM网络信息(XML配置)
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
64 android允许程序访问WIFI网络信息(XML配置)
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
65 android允许程序更新电池状态(XML配置)
<uses-permission android:name="android.permission.BATTERY_STATS"/>
66 android允许程序写短信(XML配置)
<uses-permission android:name="android.permission.WRITE_SMS"/>
67 android允许程序设置壁纸(XML配置)
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
68 android允许程序使用蓝牙(XML配置)
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
69 android允许程序打电话(XML配置)
<uses-permission android:name="android.permission.CALL_PHONE"/>
70 android允许程序使用照相设备(XML配置)
<uses-permission android:name="android.permission.CAMERA"/>
71 android允许程序改变网络状态(XML配置)
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
72 android允许程序改变WIFI状态(XML配置)
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
73 android允许程序删除缓存文件(XML配置)
<uses-permission android:name="android.permission.DELETE_CACHE_FILES"/>
74 android允许程序删除包(XML配置)
<uses-permission android:name="android.permission.DELETE_PACKAGES"/>
75 android允许程序禁用键盘锁(XML配置)
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
76 android允许程序获取任务信息(XML配置)
<uses-permission android:name="android.permission.GET_TASKS"/>
77 android允许程序截获鼠标或键盘等事件(XML配置)
<uses-permission android:name="android.permission.INJECT_EVENTS"/>
78 android允许程序使用socket(XML配置)
<uses-permission android:name="android.permission.INTERNET"/>
79 android允许程序读取日历(XML配置)
<uses-permission android:name="android.permission.READ_CALENDAR"/>
80 android允许程序读取系统日志(XML配置)
<uses-permission android:name="android.permission.READ_LOGS"/>
81 android允许程序读取所有者数据(XML配置)
<uses-permission android:name="android.permission.READ_OWNER_DATA"/>
82 android允许程序读取短信(XML配置)
<uses-permission android:name="android.permission.READ_SMS"/>
83 android允许程序重启设备(XML配置)
<uses-permission android:name="android.permission.REBOOT"/>
84 android允许程序录制音频(XML配置)
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
85 android允许程序发送短信(XML配置)
<uses-permission android:name="android.permission.SEND_SMS"/>
86 android允许程序将自己置为最前(XML配置)
<uses-permission android:name="android.permission.SET_PROCESS_FOREGROUND"/>
87 android创建图像图片Bitmap
Resources res = getResources();
Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.hh);
88 android取得远程图片HttpURL
Connection conn = (HttpURLConnection)imageUrl.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
89 android允许程序发送短信(XML配置)
<uses-permission android:name="android.permission.SEND_SMS"/>
90 android启动和结束服务
startService(new Intent("qsr.test.MyService"));
stopService(new Intent("qsr.test.MyService"));
91 android创建和配置Service
public class MyService extends Service {
public IBinder onBind(Intent arg0){
return null;
}
public void onStart(Intent intent,int startId){
super.onStart(intent, startId);
//to do something when start
}
public void onDestroy(){
super.onDestroy();
//to do something when stop
}
}
//xml配置
<service android:name=".MyService">
<intent-filter>
<action android:name="android.intent.action.TEST_SERVICE" />
<category android:name="android.intent.category.default" />
</intent-filter>
</service>
92 android获得系统感应设备
SensorManager sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
93 android设置控件布局参数//高100，宽60，x=0，y=0；
textView01.setLayoutParams(new AbsoluteLayout.LayoutParams(100,60,0,0));
94 android创建Drawable对象
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.hh);
95 android访问网页
Uri uri = Uri.parse("http://www.google.com");
Intent intent = new Intent(Intent.ACTION_VIEW,uri);
startActivity(intent);
96 android打电话
Uri uri = Uri.parse("tel:00000000");
Intent intent = new Intent(Intent.ACTION_DIAL, uri);
startActivity(intent);
97 android播放歌曲
Intent intent = new Intent(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file:///sdcard/test.mp3");
intent.setDataAndType(uri, "audio/mp3");
startActivity(intent);
98 android发送邮件
Intent intent=new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_TEXT, "The email text");
intent.setType("text/plain");
startActivity(Intent.createChooser(intent, "Choose Email Client"));
99 android发短信
Uri uri = Uri.parse("smsto:123456789");
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra("sms_body", "The SMS text");
startActivity(intent);
100 android安装程序
Uri installUri = Uri.fromParts("package", "xxx", null);
Intent intent = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
startActivity(intent);
101 android卸载程序
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
Intent intent = new Intent(Intent.ACTION_DELETE, uninstallUri);
startActivity(intent);
102 android从xml配置获得控件对象
//TestActivity.java
textView = (TextView) findViewById(R.id.TextView01);
//main.xml
<TextView
android:text = "TextView01"
android:id = "@+id/TextView01"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_x = "60px"
android:layout_y = "60px" />
103 android获得触摸屏压力
public boolean onTouch(View v, MotionEvent event) {
float pressure = event.getPressure();
return false;
}
104 android给文本加上滚动条
TextView textView = new TextView(this);
textView.setText(string);
ScrollView scrollView = new ScrollView(this);
scrollView.addView(textView);
setContentView(scrollView);
105 android获得正在运行的所有服务
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
StringBuffer serviceInfo = new StringBuffer();
ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
List<RunningServiceInfo> services = activityManager.getRunningServices(256);
Iterator<RunningServiceInfo> iterator = services.iterator();
while (iterator.hasNext()){
RunningServiceInfo si = (RunningServiceInfo)iterator.next();
serviceInfo.append("pid: ").append(si.pid);
serviceInfo.append("process: ").append(si.process);
}
TextView textView = new TextView(this);
textView.setText(serviceInfo.toString());
ScrollView scrollView = new ScrollView(this);
scrollView.addView(textView);
setContentView(scrollView);
}
106 android使用ContentResolver获得联系人姓名和号码
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(People.CONTENT_URI, null, null, null, null);
cur.moveToFirst();
do{
int nameColumn = cur.getColumnIndex(People.NAME);
int phoneColumn = cur.getColumnIndex(People.NUMBER);
String name = cur.getString(nameColumn);
String phoneNumber = cur.getString(phoneColumn);
Toast.makeText(this,name,Toast.LENGTH_LONG).show();
Toast.makeText(this,phoneNumber,Toast.LENGTH_LONG).show();
} while (cur.moveToNext());
107 android创建WebView
WebView webView = new WebView(this);
webView.loadData("<html>"+"<head>test</head>"+"<body>test</body>"+"</html>", "text/html", "utf-8");
108 android设置地图是否显示卫星和街道
mapView.setSatellite(false);
mapView.setStreetView(true);
109 android单选框清除
radioGroup.clearCheck();
110 android给文本增加链接
Linkify.addLinks(mTextView01,Linkify.WEB_URLS);
Linkify.addLinks(mTextView02,Linkify.EMAIL_ADDRESSES);
Linkify.addLinks(mTextView03,Linkify.PHONE_NUMBERS);
111 android设置手机震动
Vibrator vibrator = (Vibrator)getApplication().getSystemService(Service.VIBRATOR_SERVICE);
vibrator.vibrate(new long[]{1000,1000,1000,1000},-1);//震动一秒，停一秒，再震一秒
112 android创建下拉框
Spinner spinner = new Spinner(this);
113 android给spinner添加事件
spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> parent,View view,int position,long id){
}
public void onNothingSelected(AdapterView<?> parent){
}
});
114 android图片的显示方式
ImageView imageView = new ImageView(this);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);//适应大小
imageView.setScaleType(ImageView.ScaleType.CENTER);//原始大小，居中显示
115 android取得缓存目录
File cacheDir = this.getCacheDir();
116 android取得当前文件目录
File fileDir = this.getFilesDir();
117 android判断当前wifi是否可用
WifiManager aWiFiManager = (WifiManager)this.getSystemService(Context.WIFI_SERVICE);
boolean isEnabled = aWiFiManager.isWifiEnabled;
118 android判断当前wifi是否已经打开
WifiManager aWiFiManager = (WifiManager)this.getSystemService(Context.WIFI_SERVICE);
if(aWiFiManager.getWifiState()==WifiManager.WIFI_STATE_ENABLED)
Log.i("TEST","it is open");
119 android判断SIM卡状态
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
if(telephonyManager.getSimState()==telephonyManager.SIM_STATE_READY){
Log.i("TEST","正常");
}
else if(telephonyManager.getSimState()==telephonyManager.SIM_STATE_ABSENT){
Log.i("TEST","无SIM卡");
}
120 android取得SIM卡商名称
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
String name = telephonyManager.getSimOperatorName();
121 android为activity增加键盘事件
public boolean onKeyDown(int keyCode, KeyEvent event){
switch(keyCode){
case KeyEvent.KEYCODE_DPAD_UP:
Log.i("上",String.valueOf(keyCode));
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
Log.i("下",String.valueOf(keyCode));
break;
case KeyEvent.KEYCODE_DPAD_LEFT:
Log.i("左",String.valueOf(keyCode));
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
Log.i("右",String.valueOf(keyCode));
break;
case KeyEvent.KEYCODE_DPAD_CENTER:
Log.i("中",String.valueOf(keyCode));
break;
}
return super.onKeyDown(keyCode, event);
}
122 android显示正在运行的程序
ActivityManager mActivityManager = (ActivityManager)getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> mRunningTasks = mActivityManager.getRunningTasks(100);
for(ActivityManager.RunningTaskInfo task : mRunningTasks){
String taskInfo = task.baseActivity.getClassName()+"(ID=" + amTask.id +")");
}
123 android切换横竖屏
if(getRequestedOrientation()==ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
else if(getRequestedOrientation()==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}//PORTRAIT竖；LANDSCAPE横
124 android判断网络类型是否为GPRS
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
if(telephonyManager.getNetworkType()==telephonyManager.NETWORK_TYPE_GPRS)
125 android发送http请求给网页
String uriAPI = "http://127.0.0.1:8080/test/index.jsp";
HttpPost httpRequest = new HttpPost(uriAPI);
List <NameValuePair> params = new ArrayList <NameValuePair>();
params.add(new BasicNameValuePair("username", "test"));
try {
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
if(httpResponse.getStatusLine().getStatusCode() == 200){
String strResult = EntityUtils.toString(httpResponse.getEntity());
}
} catch (IOException e) {
e.printStackTrace();
}
126 android创建带图片的按钮
ImageButton imageButton = new ImageButton(this);
imageButton.setImageResource(R.drawable.test);
127 android创建WebView
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);
layout.addView(button);
layout.removeView(button);
128 android layout设置背景图片
LinearLayout layout = new LinearLayout(this);
layout.setBackgroundResource(R.drawable.hh);//图片放在drawable下了，名字是hh.jpg
129 android设置铃声
Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
130 android设置网络请求方式/缓存/格式/编码
HttpURLConnection con=(HttpURLConnection)url.openConnection();
con.setUseCaches(false);//不使用缓存
con.setRequestMethod("POST");//请求方式是post
con.setRequestProperty("Content-Type", "text/xml");//格式
con.setRequestProperty("Charset", "UTF-8");//编码
131 android判断是否为有效的网络url
URLUtil.isNetworkUrl(strPath);
132 android创建垂直滚动条
ScrollView scrollView = new ScrollView(this);
133 android创建水平滚动条
HorizontalScrollView horizontalScrollView = new HorizontalScrollView(this);
134 android创建自动完成文本框
AutoCompleteTextView autoCompleteTextView = new AutoCompleteTextView(this);
135 android创建地图控件
MapViewMapView mapView = new MapView(this);
136 android设置地图放大系数
mapController = mapView.getController();
mapController.setZoom(12);
137 android layout增加和删除控件
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);
layout.addView(button);
layout.removeView(button);
138 android刷新地图显示函数
//继承MapActivity并重写以下方法
public void refreshMapView(){
}
139 android创建LocationManager
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
140 android设置webView的javascript有效
WebView webView = new WebView(this);
webView.setJavaScriptEnabled(true);
141 android设置webView的保存密码有效
WebView webView = new WebView(this);
webSettings.setSavePassword(true);
142 android获得PowerManager
PowerManager powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);
143 android相机的预览parameters.setPreviewSize(640, 480);//参数的其他设定参考“设置相机图片大小和像素等”
camera.setPreviewDisplay(surfaceHolder);//这里是个SurfaceHolder对象
camera.startPreview();
camera.stopPreview();
144 android Google Map的移动
GeoPoint point = new GeoPoint(xxx, yyy);
MapController controller = mapView.getController();
controller.animateTo(point);
145 android设置画笔粗细
Paint paint= new Paint();
paint.setStrokeWidth(1);
146 android打开相机
Camera.open();
147 android设置相机图片大小和像素等
Camera.Parameters parameters = camera.getParameters();
//设置相片格式为
JPEGparameters.setPictureFormat(PixelFormat.JPEG);
//设置图片分辨率大小
parameters.setPictureSize(640, 480);
camera.setParameters(parameters);
148 android将屏幕亮着
PowerManager.WakeLock wakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "BackLight");
149 android暂停和恢复
activityprotected void onPause(){
super.onPause();
}
protected void onResume() {
super.onResume();
}
150 android保存和恢复canvas设置
canvas.save();//保存设置
//之间做一些变换，转移，拉伸等操作
canvas.restore();//恢复设置
151 android地图搜索
Intent search = new Intent(Intent.ACTION_WEB_SEARCH);
search.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
search.putExtra(SearchManager.QUERY, "new york");
startActivity(search);
152 android设置播放器音量
mediaPlayer.setVolume(10, 10);
153 android播放器跳转到具体位置
mediaPlayer.seekTo(0);//0的单位是毫秒
154 android获得手机号码和手机串号(IMEI)
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String imei = telephonyManager.getDeviceId();
String tel = telephonyManager.getLine1Number();
155 android闹钟设置代码
//接受闹铃并显示提示
class AlarmReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "时间到", Toast.LENGTH_LONG).show();
}
}
//实例化自定义的 BroadcastReceiver
AlarmReceiver receiver = new AlarmReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction("android.intent.action.BOOT_COMPLETED");
//以编程方式注册BroadcastReceiver
//xml配置方式见下
//一般在 OnStart时注册，在 OnStop时取消注册
registerReceiver(receiver, filter);
Intent intent = new Intent(this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
//一次闹铃
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() +1000, pendingIntent);
//周期闹铃
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 1000, 10000, pendingIntent);
//xml配置
<receiver android:name=".AlarmReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
156 android接收系统启动完毕的broadcast的权限
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
157 android多媒体录制
MediaRecorder recorder = new MediaRecorder();
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
//视频
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
//音频
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile("/sdcard/media/1.3gp");
try {
recorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
recorder.start();
158 android视频播放
VideoView videoView = new VideoView(this);
setContentView(videoView);
videoView.setVideoURI(Uri.parse("/sdcard/1.3gp"));
videoView.requestFocus();
videoView.start();
159 android绘制文字
canvas.drawText(str, 30, 30, paint);
160 android判断QWERTY键盘硬件是否滑出
Configuration config = getResources().getConfiguration();
if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_NO){
}else if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_YES){
}
161 android清除手机
cookieCookieSyncManager.createInstance(getApplicationContext());
CookieManager.getInstance().removeAllCookie();
162 android读写文件
//读：
public String ReadSettings(Context context){
FileInputStream fIn = null;
InputStreamReader isr = null;
char[] inputBuffer = new char[255];
String data = null;
try{
fIn = openFileInput("settings.dat");
isr = new InputStreamReader(fIn);
isr.read(inputBuffer);
data = new String(inputBuffer);
Toast.makeText(context, "Settings read",Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Settings not read",Toast.LENGTH_SHORT).show();
}
finally {
try {
isr.close(); fIn.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return data;
}
//写：
public void WriteSettings(Context context, String data){
FileOutputStream fOut = null;
OutputStreamWriter osw = null;
try{
fOut = openFileOutput("settings.dat",MODE_PRIVATE);
osw = new OutputStreamWriter(fOut);
osw.write(data);
osw.flush();
Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show();
}
finally {
try {
osw.close();
fOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
163 android 判断不可卸载的程序
PackageManager mPm = getPackageManager();
List<ApplicationInfo> installedAppList = mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
for(ApplicationInfo appInfo :installedAppList) {
boolean flag = false;
if ((appInfo.flags &ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0){// Updated system app
flag = true;
} else if ((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {// Non-system app
flag = true;
}
if (flag){
appList.add(appInfo);
}
}
164 android判断是否飞行模式
boolean isEnabled = Settings.System.getInt(context.getContentResolver(), Settings.System.AIRPLANE_MODE_ON, 0) == 1;
请勿发布不友善或者负能量的内容。与人为善，比聪明更重要！
技术博客集 - 网站简介：
前后端技术：
后端基于Hyperf2.1框架开发,前端使用Bootstrap可视化布局系统生成
网站主要作用：
1.编程技术分享及讨论交流，内置聊天系统;
2.测试交流框架问题，比如：Hyperf、Laravel、TP、beego;
3.本站数据是基于大数据采集等爬虫技术为基础助力分享知识，如有侵权请发邮件到站长邮箱，站长会尽快处理;
4.站长邮箱：[email protected];
文章归档
文章标签
友情链接
