[Android]APK程序卸载揭示 (转)

[Android]APK程序卸载提示 (转)
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"/>