Android上能不能實現卸載時提示呢，比如卸載某某軟體時，做個使用者調查卸載的原因。
我以前想著是的不行的，以前的想法是：
Windows上卸載時能實現此功能是因為有些程式的卸載是自己實現的，非系統操作。
但android上目前來說還不支援，系統卸載時，還沒發現有啥介面可以和目標卸載程式交互。
呵呵，今天鼓搗LogCat,發現還是可以的。
實現基礎是：
1.通過註冊許可權，能夠獲取LogCat的輸出流的輸出資訊。
2.進入系統的卸載介面時，"打包安裝程式(com.android.packageinstaller)"會輸出如下資訊
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，有這句話就足夠了。截取輸出流資訊，當獲取字串中包含"android.intent.action.DELETE"和"<you_package>"時，就啟動卸載提示頁面。
話就這麼多了。接下來看效果圖，上代碼。
1.package lab.sodino.uninstallhint;
2.
3.import android.app.Activity;
4.import android.content.Intent;
5.import android.os.Bundle;
6.import android.os.Handler;
7.import android.os.Message;
8.import android.view.View;
9.import android.widget.Button;
10.import android.widget.TextView;
11.
12./**
13.* @author Sodino E-mail:sodinoopen@hotmail.com
14.* @version Time：2011-1-12 上午10:09:59
15.*/
16.public class MainActivity extends Activity implements LogcatObserver {
17. private TextView txtInfo;
18. private Handler handler;
19.
20. public void onCreate(Bundle savedInstanceState) {
21. super.onCreate(savedInstanceState);
22. setContentView(R.layout.main);
23. Button btnScannerLogcat = (Button) findViewById(R.id.btnScanLogcat);
24. btnScannerLogcat.setOnClickListener(new Button.OnClickListener() {
25. public void onClick(View view) {
26. // 開啟Logcat流監聽
27. LogcatScanner.startScanLogcatInfo(MainActivity.this);
28. }
29. });
30. Button btnUninstallMe = (Button) findViewById(R.id.btnUninstallMe);
31. btnUninstallMe.setOnClickListener(new Button.OnClickListener() {
32. public void onClick(View view) {
33. // 調用應用程式資訊
34. Intent intent = new Intent(Intent.ACTION_VIEW);
35. // com.android.settings/.InstalledAppDetails
36. intent.setClassName("com.android.settings", "com.android.settings.InstalledAppDetails");
37. intent.putExtra("pkg", "lab.sodino.uninstallhint");
38. startActivity(intent);
39. }
40. });
41. txtInfo = (TextView) findViewById(R.id.txtInfo);
42. handler = new Handler() {
43. public void handleMessage(Message msg) {
44. txtInfo.append(String.valueOf(msg.obj) + "\n");
45. }
46. };
47. }
48.
49. public void handleNewLine(String info) {
50. Message msg = new Message();
51. msg.obj = info;
52. handler.sendMessage(msg);
53. if (info.contains("android.intent.action.DELETE") && info.contains(getPackageName())) {
54. // 啟動刪除提示
55. Intent intent = new Intent();
56. intent.setClass(this, UninstallWarningActivity.class);
57. intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
58. startActivity(intent);
59. }
60. }
61.}
複製代碼
1.package lab.sodino.uninstallhint;
2.
3.import java.io.DataInputStream;
4.import java.io.IOException;
5.import java.io.InputStream;
6.
7./**
8.*@author Sodino Email:sodinoopen@hotmail<br/>
9.*@version 2011-1-22 上午11:10:56
10.*/
11.public class LogcatScanner {
12. private static AndroidLogcatScanner scannerThead;
13.
14. public final static void startScanLogcatInfo(LogcatObserver observer) {
15. if (scannerThead == null) {
16. scannerThead = new AndroidLogcatScanner(observer);
17. scannerThead.start();
18. LogOut.out(LogcatScanner.class, "scannerThread.start()");
19. }
20. }
21.
22. static class AndroidLogcatScanner extends Thread {
23. private LogcatObserver observer;
24.
25. public AndroidLogcatScanner(LogcatObserver observer) {
26. this.observer = observer;
27. }
28.
29. public void run() {
30. String[] cmds = { "logcat", "-c" };
31. String shellCmd = "logcat";
32. Process process = null;
33. InputStream is = null;
34.
DataInputStream dis = null;
35. String line = "";
36. Runtime runtime = Runtime.getRuntime();
37. try {
38. observer.handleNewLine(line);
39. int waitValue;
40. waitValue = runtime.exec(cmds).waitFor();
41. observer.handleNewLine("waitValue=" + waitValue + "\n Has do Clear logcat cache.");
42. process = runtime.exec(shellCmd);
43. is = process.getInputStream();
44. dis = new DataInputStream(is);
45. while ((line = dis.readLine()) != null) {
46. observer.handleNewLine(line);
47. }
48. } catch (InterruptedException e) {
49. e.printStackTrace();
50. } catch (IOException ie) {
51. ie.printStackTrace();
52. } finally {
53. try {
54. if (dis != null) {
55. dis.close();
56. }
57. if (is != null) {
58. is.close();
59. }
60. if (process != null) {
61. process.destroy();
62. }
63. } catch (Exception e) {
64. e.printStackTrace();
65. }
66. }
67. }
68. }
69.}
複製代碼
1.package lab.sodino.uninstallhint;
2.
3./**
4.* @author Sodino E-mail:sodinoopen@hotmail.com
5.* @version Time：2011-1-22 下午03:00:54
6.*/
7.public interface LogcatObserver {
8. public void handleNewLine(String line);
9.}
複製代碼
1.package lab.sodino.uninstallhint;
2.
3.import android.app.Activity;
4.import android.app.ActivityManager;
5.import android.content.Context;
6.import android.content.Intent;
7.import android.os.Bundle;
8.import android.view.View;
9.import android.widget.Button;
10.
11./**
12.* @author Sodino E-mail:sodinoopen@hotmail.com
13.* @version Time：2011-1-12 上午10:26:09
14.*/
15.public class UninstallWarningActivity extends Activity {
16. public void onCreate(Bundle savedInstanceState) {
17. super.onCreate(savedInstanceState);
18. setContentView(R.layout.uninstall_warning);
19. Button btnContinue = (Button) findViewById(R.id.btnContinue);
20. btnContinue.setOnClickListener(new Button.OnClickListener() {
21. public void onClick(View view) {
22. UninstallWarningActivity.this.finish();
23. }
24. });
25. Button btnCancel = (Button) findViewById(R.id.btnCancel);
26. btnCancel.setOnClickListener(new Button.OnClickListener() {
27. public void onClick(View view) {
28. UninstallWarningActivity.this.finish();
29. ActivityManager actMag = (ActivityManager) UninstallWarningActivity.this
30. .getSystemService(Context.ACTIVITY_SERVICE);
31. //殺掉系統的打包安裝程式。
32. if (android.os.Build.VERSION.SDK_INT < 8) {
33. actMag.restartPackage("com.android.packageinstaller");
34. } else {
35. actMag.killBackgroundProcesses("com.android.packageinstaller");
36. }
37. Intent i = new Intent(Intent.ACTION_MAIN);
38. i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
39. i.addCategory(Intent.CATEGORY_HOME);
40. startActivity(i);
41. }
42. });
43. }
44.}
最後再添加上許可權：
1. <uses-permission android:name="android.permission.READ_LOGS" />
2. <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
3. <uses-permission android:name="android.permission.RESTART_PACKAGES"/>
來源:http://blog.csdn.net/sodino/article/details/6158659
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