Process分析

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本文分析android.os.Process

1、Android杀死APP。示例演示。

public class MainActivity extends Activity {private static final String TAG = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {Log.d(TAG, "onCreate");super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overrideprotected void onDestroy() {Log.d(TAG, "onDestroy");super.onDestroy();}public void onClick(View v){switch (v.getId()) {case R.id.btn_kill://不调用onDestroy,杀死ApplicationProcess.killProcess(Process.myPid());break;case R.id.btn_exit://ensure that, when VM is about to exit, all objects are finalizedSystem.runFinalizersOnExit(true);//不调用onDestroy,杀死Application//VM stop,program exitSystem.exit(0);break;case R.id.btn_finish://调用onDestroy,不会杀死Applicationthis.finish();break;case R.id.btn_thread:Thread t = Thread.currentThread();//查看进程信息Log.d(TAG, t.getName()+"-"+t.getId()+"-"+t.getPriority()+"-"+t.getState().name()+"-"+t.getThreadGroup().getName());//设置线程优先级,Libcore.os.gettid()Process.setThreadPriority(Process.myTid(), 1);Log.d(TAG, Process.myTid()+"-priority:"+Process.getThreadPriority(Process.myTid()));//VMThread.currentThread()t.setPriority(1);Log.d(TAG, t.getId()+"-priority:"+t.getPriority());break;case R.id.btn_second:Intent intent = new Intent(this, SecondActivity.class);startActivity(intent);default:break;}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    xmlns:android="http://schemas.android.com/apk/res/android">    <Button         android:id="@+id/btn_kill"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Process.killProcess"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_exit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="System.exit"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_finish"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Activity.finish"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_thread"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Thread.stop"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_second"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="second"        android:onClick="onClick"/></LinearLayout>

public class SecondActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {Log.w(getClass().getSimpleName(), "onCreate");super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);}@Overrideprotected void onDestroy() {Log.w(getClass().getSimpleName(), "onDestroy");super.onDestroy();}public void onClick(View v){switch (v.getId()) {case R.id.btn_kill:Process.killProcess(Process.myPid());break;case R.id.btn_exit:System.exit(0);break;case R.id.btn_third:Intent intent = new Intent(this, ThirdActivity.class);startActivity(intent);default:break;}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    xmlns:android="http://schemas.android.com/apk/res/android">    <Button         android:id="@+id/btn_kill"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Process.killProcess"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_exit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="System.exit"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_third"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="third"        android:onClick="onClick"/></LinearLayout>

public class ThirdActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {Log.w(getClass().getSimpleName(), "onCreate");super.onCreate(savedInstanceState);setContentView(R.layout.activity_third);}@Overrideprotected void onDestroy() {Log.w(getClass().getSimpleName(), "onDestroy");super.onDestroy();}public void onClick(View v){switch (v.getId()) {case R.id.btn_kill://杀死APP，然后直接创建SecondActivity，摁back键创建MainActivity销毁SecondActivityProcess.killProcess(Process.myPid());break;case R.id.btn_exit:System.exit(0);break;default:break;}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    xmlns:android="http://schemas.android.com/apk/res/android">    <Button         android:id="@+id/btn_kill"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Process.killProcess"        android:onClick="onClick"/>    <Button         android:id="@+id/btn_exit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="System.exit"        android:onClick="onClick"/></LinearLayout>

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