[Android]APK程序卸载提示

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 = runtime.exec(cmds).waitFor();                                observer.handleNewLine("waitValue=" + 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);                        }                });        }}

        <uses-permission android:name="android.permission.READ_LOGS" />        <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>        <uses-permission android:name="android.permission.RESTART_PACKAGES"/>

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