37.缓存清理

CleanCacheActivity

• 反射调用系统隐藏的方法
• 不能自己清理缓冲，需要系统界面去删除，但是系统有个漏洞，当告诉系统清除的数据大于系统的内存的时候，系统会全部清理

1. publicclassCleanCacheActivityextendsActivity{
2. protectedstaticfinalint SCANING =1;
3. publicstaticfinalint SHOW_CACHE_INFO =2;
4. protectedstaticfinalint SCAN_FINISH =3;
5. privateProgressBar progressBar1;
6. privateLinearLayout ll_container;
7. privateTextView tv_status;
8. privatePackageManager pm;
9. privateHandler handler =newHandler(){
10. publicvoid handleMessage(android.os.Message msg){
11. switch(msg.what){
12. case SCANING:
13. String text =(String) msg.obj;
14. tv_status.setText("正在扫描："+text);
15. break;
16. case SHOW_CACHE_INFO:
17. View view =View.inflate(getApplicationContext(), R.layout.list_appcache_item,null);
18. ImageView iv =(ImageView) view.findViewById(R.id.iv_icon);
19. TextView tv_name =(TextView) view.findViewById(R.id.tv_name);
20. TextView tv_cache =(TextView) view.findViewById(R.id.tv_cache);
21. finalCacheInfo info =(CacheInfo) msg.obj;
22. iv.setImageDrawable(info.icon);
23. tv_name.setText(info.name);
24. tv_cache.setText("缓存大小："+Formatter.formatFileSize(getApplicationContext(), info.size));
25. ImageView iv_delete =(ImageView) view.findViewById(R.id.iv_delete);
26. iv_delete.setOnClickListener(newOnClickListener(){
27. @Override
28. publicvoid onClick(View v){
29. Method[] methods =PackageManager.class.getMethods();
30. for(Method method : methods){
31. try{
32. if("deleteApplicationCacheFiles".equals(method.getName())){
33. method.invoke(pm, info.packname,newIPackageDataObserver.Stub(){
34. @Override
35. publicvoid onRemoveCompleted(String packageName,boolean succeeded)
36. throwsRemoteException{
38. }
39. });
40. }
41. }catch(Exception e){
42. Intent intent =newIntent();
43. intent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
44. intent.addCategory(Intent.CATEGORY_DEFAULT);
45. intent.setData(Uri.parse("package:"+info.packname));
46. startActivity(intent);
47. e.printStackTrace();
48. }
49. }
50. }
51. });
52. ll_container.addView(view,0);
53. break;
54. case SCAN_FINISH:
55. tv_status.setText("扫描完毕");
56. break;
57. }
58. };
59. };
61. @Override
62. protectedvoid onCreate(Bundle savedInstanceState){
63. super.onCreate(savedInstanceState);
64. setContentView(R.layout.activity_clean_cache);
65. progressBar1 =(ProgressBar) findViewById(R.id.progressBar1);
66. ll_container =(LinearLayout) findViewById(R.id.ll_container);
67. tv_status =(TextView) findViewById(R.id.tv_status);
69. newThread(){
70. publicvoid run(){
71. pm = getPackageManager();
72. List<PackageInfo> packageInfos = pm
73. .getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
74. progressBar1.setMax(packageInfos.size());
75. int total =0;
76. for(PackageInfo packinfo: packageInfos){
77. try{
78. String packname = packinfo.packageName;
79. Method method =PackageManager.class.getMethod("getPackageSizeInfo",String.class,IPackageStatsObserver.class);
80. //第一个参数：哪个用这个方法，第二个参数：是可变参数，方法里的参数，第三个参数：接口AIDL，需要拷到自己项目里，包名必须和以前一样，然后会在gen目录自动生成文件去调用

81. method.invoke(pm, packname,newMyObserver());
82. Message msg =Message.obtain();
83. msg.what= SCANING;
84. msg.obj = packinfo.applicationInfo.loadLabel(pm).toString();
85. handler.sendMessage(msg);
86. }catch(Exception e){
87. e.printStackTrace();
88. }
89. total ++;
90. progressBar1.setProgress(total);
91. try{
92. Thread.sleep(50);
93. }catch(InterruptedException e){
94. e.printStackTrace();
95. }
96. }
97. Message msg =Message.obtain();
98. msg.what = SCAN_FINISH;
99. handler.sendMessage(msg);
100. };
101. }.start();
103. }
104. privateclassMyObserverextendsIPackageStatsObserver.Stub{
105. //这个是AIDL接口
106. @Override
107. publicvoid onGetStatsCompleted(PackageStats pStats,boolean succeeded)
108. throwsRemoteException{
109. long cache = pStats.cacheSize;
110. long codeSize = pStats.codeSize;
111. if(cache>0){
112. //System.out.println("当前应用程序："+pStats.packageName+"有缓存："+Formatter.formatFileSize(getApplicationContext(), cache));
113. try{
114. Message msg =Message.obtain();
115. msg.what = SHOW_CACHE_INFO;
116. CacheInfo cacheInfo =newCacheInfo();
117. cacheInfo.packname = pStats.packageName;
118. cacheInfo.icon = pm.getApplicationInfo(pStats.packageName,0).loadIcon(pm);
119. cacheInfo.name = pm.getApplicationInfo(pStats.packageName,0).loadLabel(pm).toString();
120. cacheInfo.size = cache;
121. msg.obj = cacheInfo;
122. handler.sendMessage(msg);
123. }catch(Exception e){
124. e.printStackTrace();
125. }
126. }
127. }
128. }
130. classCacheInfo{
131. Drawable icon;
132. String name;
133. long size;
134. String packname;
135. }
138. publicvoid cleanAll(View view){
139. // /freeStorageAndNotify
140. Method[] methods =PackageManager.class.getMethods();
141. for(Method method:methods){
142. if("freeStorageAndNotify".equals(method.getName())){
143. try{
144. method.invoke(pm,Integer.MAX_VALUE,newIPackageDataObserver.Stub(){
145. @Override
146. publicvoid onRemoveCompleted(String packageName,
147. boolean succeeded)throwsRemoteException{
148. System.out.println(succeeded);
149. }
150. });
151. }catch(Exception e){
152. e.printStackTrace();
153. }
154. return;
155. }
156. }
157. }
159. }

来自为知笔记(Wiz)

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