Android常用代码集合

这篇文章主要记录一些常用的一些代码段，方便以后查阅，不断更新中。

1：调用浏览器，载入某网址

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Uri uri = Uri.parse("http://www.android-study.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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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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<?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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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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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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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Androidinstaller安装和卸载程序

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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

1	activityManager.restartPackage(packageName);

8：设置默认来电铃声

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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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模拟HOME按键

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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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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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void sendFile(String path) { File mZipFile=new File(path); Intent intent = new Intent(Intent.ACTION_SEND); //  intent.setClassName("com.android.bluetooth", "com.broadcom.bt.app.opp.OppLauncherActivity"); // intent.setClassName("com.android.bluetooth", "com.android.bluetooth.opp.BluetoothOppLauncherActivity"); intent.putExtra("subject", mZipFile .getName()); // intent.putExtra("body", "content by chopsticks"); // 正文 intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(mZipFile)); // 添加附件，附件为file对象 if (mZipFile.getName().endsWith(".gz")) { intent .setType("application/x-gzip"); // 如果是gz使用gzip的mime } else if (mZipFile.getName().endsWith( ".txt")) { intent.setType("text/plain"); // 纯文本则用text/plain的mime } else if (mZipFile.getName().endsWith( ".zip")) { intent.setType("application/zip"); // 纯文本则用text/plain的mime } else { intent .setType("application/octet-stream"); // 其他的均使用流当做二进制数据来发送 } // startActivity(intent); startActivity( Intent.createChooser(intent, "选择蓝牙客户端")); }