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Sodino

2011-01-24

Android上能不能实现卸载时提示呢，比如卸载某某软件时，做个用户调查卸载的原因。 我以前想着是的不行的，以前的想法是： Windows上卸载时能实现此功能是因为有些程序的卸载是自己实现的，非系统操作。 但android上目前来说还不支持，系统卸载时，还没发现有啥接口可以和目标卸载程序交互。
呵呵，今天鼓捣LogCat,发现还是可以的。 实现基础是： 1.通过注册权限，能够获取LogCat的输出流的输出信息。 2.进入系统的卸载界面时，"打包安装程序(com.android.packageinstaller)"会输出如下信息
01-22 16:29:15.250: INFO/ActivityManager(147): Starting activity: Intent { act=android.intent.action.DELETE dat=package:lab.sodino.uninstallhint cmp=com.android.packageinstaller/.UninstallerActivity }
好了，有这句话就足够了。截取输出流信息，当获取字符串中包含"android.intent.action.DELETE"和"<you_package>"时，就启动卸载提示页面。
话就这么多了。接下来看效果图，上代码。

package lab.sodino.uninstallhint;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.TextView;/** * @author Sodino E-mail:sodinoopen@hotmail.com * @version Time：2011-1-12 上午10:09:59 */public class MainActivity extends Activity implements LogcatObserver { private TextView txtInfo; private Handler handler; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btnScannerLogcat = (Button) findViewById(R.id.btnScanLogcat); btnScannerLogcat.setOnClickListener(new Button.OnClickListener() { public void onClick(View view) { // 开启Logcat流监听 LogcatScanner.startScanLogcatInfo(MainActivity.this); } }); Button btnUninstallMe = (Button) findViewById(R.id.btnUninstallMe); btnUninstallMe.setOnClickListener(new Button.OnClickListener() { public void onClick(View view) { // 调用应用程序信息 Intent intent = new Intent(Intent.ACTION_VIEW); // com.android.settings/.InstalledAppDetails intent.setClassName("com.android.settings", "com.android.settings.InstalledAppDetails"); intent.putExtra("pkg", "lab.sodino.uninstallhint"); startActivity(intent); } }); txtInfo = (TextView) findViewById(R.id.txtInfo); handler = new Handler() { public void handleMessage(Message msg) { txtInfo.append(String.valueOf(msg.obj) + "/n"); } }; } public void handleNewLine(String info) { Message msg = new Message(); msg.obj = info; handler.sendMessage(msg); if (info.contains("android.intent.action.DELETE") && info.contains(getPackageName())) { // 启动删除提示 Intent intent = new Intent(); intent.setClass(this, UninstallWarningActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } }}

package lab.sodino.uninstallhint;import java.io.DataInputStream;import java.io.IOException;import java.io.InputStream;/** *@author Sodino Email:sodinoopen@hotmail<br/> *@version 2011-1-22 上午11:10:56 */public class LogcatScanner { private static AndroidLogcatScanner scannerThead; public final static void startScanLogcatInfo(LogcatObserver observer) { if (scannerThead == null) { scannerThead = new AndroidLogcatScanner(observer); scannerThead.start(); LogOut.out(LogcatScanner.class, "scannerThread.start()"); } } static class AndroidLogcatScanner extends Thread { private LogcatObserver observer; public AndroidLogcatScanner(LogcatObserver observer) { this.observer = observer; } public void run() { String[] cmds = { "logcat", "-c" }; String shellCmd = "logcat"; Process process = null; InputStream is = null; DataInputStream dis = null; String line = ""; Runtime runtime = Runtime.getRuntime(); try { observer.handleNewLine(line); int waitValue; waitValue = http://www.mamicode.com/runtime.exec(cmds).waitFor();"waitValue="http://www.mamicode.com/+ waitValue +"/n Has do Clear logcat cache."); process = runtime.exec(shellCmd); is = process.getInputStream(); dis = new DataInputStream(is); while ((line = dis.readLine()) != null) { observer.handleNewLine(line); } } catch (InterruptedException e) { e.printStackTrace(); } catch (IOException ie) { ie.printStackTrace(); } finally { try { if (dis != null) { dis.close(); } if (is != null) { is.close(); } if (process != null) { process.destroy(); } } catch (Exception e) { e.printStackTrace(); } } } }}

package lab.sodino.uninstallhint;/** * @author Sodino E-mail:sodinoopen@hotmail.com * @version Time：2011-1-22 下午03:00:54 */public interface LogcatObserver { public void handleNewLine(String line);}

package lab.sodino.uninstallhint;import android.app.Activity;import android.app.ActivityManager;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;/** * @author Sodino E-mail:sodinoopen@hotmail.com * @version Time：2011-1-12 上午10:26:09 */public class UninstallWarningActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.uninstall_warning); Button btnContinue = (Button) findViewById(R.id.btnContinue); btnContinue.setOnClickListener(new Button.OnClickListener() { public void onClick(View view) { UninstallWarningActivity.this.finish(); } }); Button btnCancel = (Button) findViewById(R.id.btnCancel); btnCancel.setOnClickListener(new Button.OnClickListener() { public void onClick(View view) { UninstallWarningActivity.this.finish(); ActivityManager actMag = (ActivityManager) UninstallWarningActivity.this .getSystemService(Context.ACTIVITY_SERVICE); //杀掉系统的打包安装程序。 if (android.os.Build.VERSION.SDK_INT < 8) { actMag.restartPackage("com.android.packageinstaller"); } else { actMag.killBackgroundProcesses("com.android.packageinstaller"); } Intent i = new Intent(Intent.ACTION_MAIN); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); i.addCategory(Intent.CATEGORY_HOME); startActivity(i); } }); }}

最后在AndroidManifest.xml中添加上权限。

[Android]APK程序卸载二次确认的实现