Android 常用代码集合

1 调用浏览器 载入某网址

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1.Uri uri = Uri.parse( "http://www.baidu.com" );          
2.Intent it =  new  Intent(Intent.ACTION_VIEW, uri);           3.startActivity(it);  
Uri uri = Uri.parse("http://www.baidu.com"); Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it); 



2 Broadcast接收系统广播的intent 监控应用程序包的安装 删除

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1.public   class  getBroadcast  extends  BroadcastReceiver {  
2.         @Override    3.         public   void  onReceive(Context context, Intent intent) {   4.                 
5.                   if (Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())){   6.                    Toast.makeText(context,  "有应用被添加" , Toast.LENGTH_LONG).show();   7.            }  
8.                 else    if (Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){   9.                    Toast.makeText(context,  "有应用被删除" , Toast.LENGTH_LONG).show();   10.            }  
11.               
12.                 else    if (Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){   13.                    Toast.makeText(context,  "有应用被替换" , Toast.LENGTH_LONG).show();   14.            }  
15.                    
16.                 else    if (Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){   17.                    Toast.makeText(context,  "按键" , Toast.LENGTH_LONG).show();   18.            }  
19.              
20.        }  
21.         
22.}  
public class getBroadcast extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if(Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())){ Toast.makeText(context, "有应用被添加", Toast.LENGTH_LONG).show(); } else if(Intent.ACTION_PACKAGE_REMOVED.equals(intent.getAction())){ Toast.makeText(context, "有应用被删除", Toast.LENGTH_LONG).show(); } else if(Intent.ACTION_PACKAGE_REPLACED.equals(intent.getAction())){ Toast.makeText(context, "有应用被替换", Toast.LENGTH_LONG).show(); } else if(Intent.ACTION_CAMERA_BUTTON.equals(intent.getAction())){ Toast.makeText(context, "按键", Toast.LENGTH_LONG).show(); } } } 

需要声明的权限如下AndroidManifest.xml


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1.<?xml version= "1.0"  encoding= "utf-8" ?>  
2.<manifest xmlns:android= "http://schemas.android.com/apk/res/android"    3.      package= "zy.Broadcast"    4.      android:versionCode= "1"    5.      android:versionName= "1.0" >   6.    <application android:icon= "@drawable/icon"  android:label= "@string/app_name" >   7.        <activity android:name= ".Broadcast"    8.                  android:label= "@string/app_name" >   9.            <intent-filter>  
10.                <action android:name= "android.intent.action.MAIN"  />   11.                <category android:name= "android.intent.category.LAUNCHER"  />   12.            </intent-filter>  
13.        </activity>  
14.      <receiver android:name= "getBroadcast"  android:enabled= "true"  >   15.         <intent-filter>  
16.             <action android:name= "android.intent.action.PACKAGE_ADDED" ></action>   17.             <!-- <action android:name= "android.intent.action.PACKAGE_CHANGED" ></action>-->   18.             <action android:name= "android.intent.action.PACKAGE_REMOVED" ></action>   19.             <action android:name= "android.intent.action.PACKAGE_REPLACED" ></action>   20.             <!-- <action android:name= "android.intent.action.PACKAGE_RESTARTED" ></action>-->   21.           <!--    <action android:name= "android.intent.action.PACKAGE_INSTALL" ></action>-->   22.               <action android:name= "android.intent.action.CAMERA_BUTTON" ></action>   23.               <data android:scheme= "package" ></data>   24.              </intent-filter>  
25.</receiver>  
26.    </application>  
27.    <uses-sdk android:minSdkVersion= "3"  />   28.      
29.</manifest>   
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="zy.Broadcast" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Broadcast" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <receiver android:name="getBroadcast" android:enabled="true" > <intent-filter> <action android:name="android.intent.action.PACKAGE_ADDED"></action> <!-- <action android:name="android.intent.action.PACKAGE_CHANGED"></action>--> <action android:name="android.intent.action.PACKAGE_REMOVED"></action> <action android:name="android.intent.action.PACKAGE_REPLACED"></action> <!-- <action android:name="android.intent.action.PACKAGE_RESTARTED"></action>--> <!-- <action android:name="android.intent.action.PACKAGE_INSTALL"></action>--> <action android:name="android.intent.action.CAMERA_BUTTON"></action> <data android:scheme="package"></data> </intent-filter> </receiver> </application> <uses-sdk android:minSdkVersion="3" /> </manifest>  



3 使用Toast输出一个字符串

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1.public   void  DisplayToast(String str)  
2.        {  
3.      Toast.makeText( this ,str,Toast.LENGTH_SHORT).show();   4.        }   
public void DisplayToast(String str) { Toast.makeText(this,str,Toast.LENGTH_SHORT).show(); }  



4 把一个字符串写进文件

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1.public   void  writefile(String str,String path )  
2.        {  
3.            File file;  
4.            FileOutputStream  out ;   5.              try  {   6.                  //创建文件    7.                 file =  new  File(path);   8.                 file.createNewFile();  
9.                   
10.                  //打开文件file的OutputStream    11.                  out  =  new  FileOutputStream(file);   12.                 String infoToWrite = str;  
13.                  //将字符串转换成byte数组写入文件    14.                  out .write(infoToWrite.getBytes());   15.                  //关闭文件file的OutputStream    16.                  out .close();   17.                   
18.                   
19.                   
20.             }  catch  (IOException e) {   21.                  //将出错信息打印到Logcat    22.              DisplayToast(e.toString());  
23.                   
24.             }  
25.        }  
public void writefile(String str,String path ) { File file; FileOutputStream out; try { //创建文件 file = new File(path); file.createNewFile(); //打开文件file的OutputStream out = new FileOutputStream(file); String infoToWrite = str; //将字符串转换成byte数组写入文件 out.write(infoToWrite.getBytes()); //关闭文件file的OutputStream out.close(); } catch (IOException e) { //将出错信息打印到Logcat DisplayToast(e.toString()); } } 



5 把文件内容读出到一个字符串

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1.public  String getinfo(String path)  
2.        {  
3.            File file;  
4.            String str= "" ;    5.            FileInputStream in;  
6.          try {   7.             //打开文件file的InputStream    8.             file =  new  File(path);   9.             in =  new  FileInputStream(file);   10.              //将文件内容全部读入到byte数组    11.              int  length = ( int )file.length();   12.              byte [] temp =  new   byte [length];   13.             in.read(temp,  0 , length);   14.              //将byte数组用UTF-8编码并存入display字符串中    15.             str =  EncodingUtils.getString(temp,TEXT_ENCODING);  
16.              //关闭文件file的InputStream    17.               
18.             in.close();  
19.         }  
20.          catch  (IOException e) {   21.               
22.          DisplayToast(e.toString());  
23.               
24.         }  
25.          return  str;   26.        }  
public String getinfo(String path) { File file; String str=""; FileInputStream in; try{ //打开文件file的InputStream file = new File(path); in = new FileInputStream(file); //将文件内容全部读入到byte数组 int length = (int)file.length(); byte[] temp = new byte[length]; in.read(temp, 0, length); //将byte数组用UTF-8编码并存入display字符串中 str = EncodingUtils.getString(temp,TEXT_ENCODING); //关闭文件file的InputStream in.close(); } catch (IOException e) { DisplayToast(e.toString()); } return str; } 



6 调用Android installer 安装和卸载程序

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1.Intent intent =  new  Intent(Intent.ACTION_VIEW);   
2.       intent.setDataAndType(Uri.fromFile( new  File( "/sdcard/WorldCupTimer.apk" )),  "application/vnd.android.package-archive" );    3.       startActivity(intent);  //安装 程序    4.         
5.       Uri packageURI = Uri.parse( "package:zy.dnh" );        6.       Intent uninstallIntent =  new  Intent(Intent.ACTION_DELETE, packageURI);        7.       startActivity(uninstallIntent); //正常卸载程序    Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new File("/sdcard/WorldCupTimer.apk")), "application/vnd.android.package-archive"); startActivity(intent); //安装 程序 Uri packageURI = Uri.parse("package:zy.dnh"); Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI); startActivity(uninstallIntent);//正常卸载程序 

7 结束某个进程

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1.activityManager.restartPackage(packageName);  
activityManager.restartPackage(packageName); 



8 设置默认来电铃声





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1.public   void  setMyRingtone()  
2.    {  
3.   File k =  new  File( "/sdcard/Shall We Talk.mp3" );  // 设置歌曲路径    4.    ContentValues values =  new  ContentValues();   5.    values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());  
6.    values.put(MediaStore.MediaColumns.TITLE,  "Shall We Talk" );   7.    values.put(MediaStore.MediaColumns.SIZE, 8474325);  
8.    values.put(MediaStore.MediaColumns.MIME_TYPE,  "audio/mp3" );   9.    values.put(MediaStore.Audio.Media.ARTIST,  "Madonna" );   10.    values.put(MediaStore.Audio.Media.DURATION, 230);  
11.    values.put(MediaStore.Audio.Media.IS_RINGTONE,  true );   12.    values.put(MediaStore.Audio.Media.IS_NOTIFICATION,  false );   13.    values.put(MediaStore.Audio.Media.IS_ALARM,  false );   14.    values.put(MediaStore.Audio.Media.IS_MUSIC,  false );   15.     // Insert it into the database    16.    Uri uri = MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath());  
17.    Uri newUri =  this .getContentResolver().insert(uri, values);   18.    RingtoneManager.setActualDefaultRingtoneUri( this , RingtoneManager.TYPE_RINGTONE, newUri);   19.    ;}  
public void setMyRingtone() { File k = new File("/sdcard/Shall We Talk.mp3"); // 设置歌曲路径 ContentValues values = new ContentValues(); values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath()); values.put(MediaStore.MediaColumns.TITLE, "Shall We Talk"); values.put(MediaStore.MediaColumns.SIZE, 8474325); values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3"); values.put(MediaStore.Audio.Media.ARTIST, "Madonna"); values.put(MediaStore.Audio.Media.DURATION, 230); values.put(MediaStore.Audio.Media.IS_RINGTONE, true); values.put(MediaStore.Audio.Media.IS_NOTIFICATION, false); values.put(MediaStore.Audio.Media.IS_ALARM, false); values.put(MediaStore.Audio.Media.IS_MUSIC, false); // Insert it into the database Uri uri = MediaStore.Audio.Media.getContentUriForPath(k.getAbsolutePath()); Uri newUri = this.getContentResolver().insert(uri, values); RingtoneManager.setActualDefaultRingtoneUri(this, RingtoneManager.TYPE_RINGTONE, newUri); ;} 



需要的权限


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1.<uses-permission android:name= "android.permission.WRITE_SETTINGS" ></uses-permission>  
<uses-permission android:name="android.permission.WRITE_SETTINGS"></uses-permission> 



模拟HOME按键


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1.Intent i= new  Intent(Intent.ACTION_MAIN);  
2.i.addCategory(Intent.CATEGORY_HOME);  
3.i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
4.context.startActivity(i);  
Intent i=new Intent(Intent.ACTION_MAIN); i.addCategory(Intent.CATEGORY_HOME); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(i); 



9 打开某一个联系人

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1.Intent intent= new  Intent();  
2.String data =  "content://contacts/people/1" ;   3.Uri  uri = Uri.parse(data);          intent.setAction(Intent.ACTION_VIEW);  
4.intent.setData(uri);  
5.startActivity(intent);  
Intent intent=new Intent(); String data = "content://contacts/people/1"; Uri uri = Uri.parse(data); intent.setAction(Intent.ACTION_VIEW); intent.setData(uri); startActivity(intent); 


10 发送文件


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1.void  sendFile(String path)  
2.{  
3.    File mZipFile= new  File(path);   4.       Intent intent =  new  Intent(    5.               Intent.ACTION_SEND);   
6.      //  intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity");    7.      // intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity");    8.       intent.putExtra( "subject" , mZipFile    9.               .getName());  //     10.         
11.       intent.putExtra( "body" ,  "content by chopsticks" );  // 正文     12.       intent.putExtra(Intent.EXTRA_STREAM,   
13.               Uri.fromFile(mZipFile));  // 添加附件，附件为file对象     14.        if  (mZipFile.getName().endsWith( ".gz" )) {    15.           intent   
16.                   .setType( "application/x-gzip" );  // 如果是gz使用gzip的mime     17.       }  else   if  (mZipFile.getName().endsWith(    18.                ".txt" )) {    19.           intent.setType( "text/plain" );  // 纯文本则用text/plain的mime     20.       }  else   if  (mZipFile.getName().endsWith(    21.                ".zip" )) {    22.           intent.setType( "application/zip" );  // 纯文本则用text/plain的mime     23.       }  else  {    24.           intent   
25.                   .setType( "application/octet-stream" );  // 其他的均使用流当做二进制数据来发送     26.       }   
27.       // startActivity(intent);    28.       startActivity(   
29.               Intent.createChooser(intent,   
30.                        "选择蓝牙客户端" ));   31.}  


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