{"id":1358,"date":"2016-03-03T11:46:24","date_gmt":"2016-03-03T03:46:24","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=1358"},"modified":"2026-08-18T12:58:49","modified_gmt":"2026-08-18T04:58:49","slug":"android%e5%86%85%e5%ad%98%e6%b3%84%e6%bc%8f%e7%bb%88%e6%9e%81%e8%a7%a3%e5%86%b3%e7%af%87","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=1358","title":{"rendered":"\u5185\u5b58\u6cc4\u6f0f\u63a2\u8ba8\u4e2d(Android\u7bc7)"},"content":{"rendered":"
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\u5185\u5b58\u6cc4\u6f0f\uff1a\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u7528\u4e86\uff0c\u5374\u88ab\u522b\u7684\u5bf9\u8c61\u8fd8\u63e1\u7740\u5f15\u7528\uff0c\u5185\u5b58\u6536\u4e0d\u56de\u53bb\u3002\u6162\u6162\u5806\u79ef\u6700\u7ec8 OOM\u3002\u5199\u4ee3\u7801\u65f6\u5c31\u8981\u907f\u5f00\u8fd9\u7c7b\u5199\u6cd5\uff0c\u63d0\u9ad8\u5065\u58ee\u6027\u3002<\/p>\n<\/blockquote>\n

<\/p>\n

\"640\"<\/a><\/p>\n

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\u4e00\u3001\u9759\u6001\u53d8\u91cf<\/span><\/h2>\n

Java \u91cc\u9759\u6001\u53d8\u91cf\u4ece\u7c7b\u52a0\u8f7d\u6d3b\u5230\u7c7b\u5378\u8f7d\uff1bAndroid \u91cc\u5c31\u662f\u8fdb\u7a0b\u6d3b\u7740\u5b83\u5c31\u5728\u3002\u8fdb\u7a0b\u4e0d\u6740\uff0c\u9759\u6001\u53d8\u91cf\u4e0d\u4f1a\u88ab\u56de\u6536\u3002\u82e5\u5b83\u5f3a\u5f15\u7528\u4e86\u67d0\u4e2a Activity \u7684\u5bf9\u8c61\uff0cActivity \u5373\u4f7f\u8d70\u4e86 onDestroy \u4e5f\u91ca\u653e\u4e0d\u4e86\uff08\u4e0d\u8981\u628a\u6267\u884c onDestroy \u548c\u88ab\u56de\u6536\u5212\u7b49\u53f7\uff09\u3002<\/p>\n

\u5bf9\u7b56\uff1a1. \u627e\u751f\u547d\u5468\u671f\u5dee\u4e0d\u591a\u7684\u66ff\u4ee3\u5bf9\u8c61\uff1b2. \u627e\u4e0d\u5230\u5c31\u628a\u5f3a\u5f15\u7528\u6539\u5f31\u5f15\u7528\u3002\u5178\u578b\uff1a\u5355\u4f8b\u62ff\u4e86 Activity \u7684 Context\u3002<\/p>\n

public class IMManager {\n  private Context context;\n  private static IMManager mInstance;\n\n  public static IMManager getInstance(Context context) {\n    if (mInstance == null) {\n      synchronized (IMManager.class) {\n        if (mInstance == null)\n          mInstance = new IMManager(context);\n      }\n    }\n    return mInstance;\n  }\n\n  private IMManager(Context context) {\n    this.context = context;\n  }\n}<\/code><\/pre>\n
getInstance \u82e5\u4f20\u5165 Activity \u7684 context\uff0c\u5355\u4f8b\u4e0d\u91ca\u653e\uff0cActivity \u4e5f\u4e0d\u91ca\u653e\u3002\u5e94\u4f20\u5165 Application \u7684 context\uff0c\u751f\u547d\u5468\u671f\u4e0e\u5355\u4f8b\u76f8\u5f53\uff1a<\/p>\n
public class IMManager {\n  private Context context;\n  private static IMManager mInstance;\n\n  public static IMManager getInstance(Context context) {\n    if (mInstance == null) {\n      synchronized (IMManager.class) {\n        if (mInstance == null)\n          \/\/\u5c06\u4f20\u5165\u7684context\u8f6c\u6362\u6210Application\u7684context\n          mInstance = new IMManager(context.getApplicationContext());\n      }\n    }\n    return mInstance;\n  }\n\n  private IMManager(Context context) {\n    this.context = context;\n  }\n}<\/code><\/pre>\n
\n
\u4e8c\u3001\u975e\u9759\u6001\u5185\u90e8\u7c7b<\/span><\/h2>\n
\u975e\u9759\u6001\u5185\u90e8\u7c7b\u5b9e\u4f8b\u4f1a\u5f15\u7528\u5916\u56f4\u5b9e\u4f8b\u3002\u82e5\u5b83\u505a\u4e86\u8017\u65f6\u64cd\u4f5c\uff0c\u5916\u56f4\u5bf9\u8c61\u6536\u4e0d\u6389\u3002\u5bf9\u7b56\uff1a1. \u6539\u6210\u9759\u6001\u5185\u90e8\u7c7b\uff1b2. \u5f3a\u5f15\u7528 Activity \u5c5e\u6027\u5219\u6539\u5f31\u5f15\u7528\uff1b3. \u4e1a\u52a1\u5141\u8bb8\u65f6\u5728 onDestroy \u7ed3\u675f\u8017\u65f6\u4efb\u52a1\u3002<\/p>\n
\u5185\u90e8\u7ebf\u7a0b<\/h3>\n
public class LeakAty extends Activity {\n\n  @Override\n  protected void onCreate(Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    setContentView(R.layout.aty_leak);\n    test();\n  }\n\n  public void test() {\n    \/\/\u533f\u540d\u5185\u90e8\u7c7b\u4f1a\u5f15\u7528\u5176\u5916\u56f4\u5b9e\u4f8bLeakAty.this,\u6240\u4ee5\u4f1a\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\n    new Thread(new Runnable() {\n      @Override\n      public void run() {\n        while (true) {\n          try {\n            Thread.sleep(1000);\n          } catch (InterruptedException e) {\n            e.printStackTrace();\n          }\n        }\n      }\n    }).start();\n  }\n}<\/code><\/pre>\n
\u628a\u65b9\u6cd5\u6539\u6210 static\uff0c\u533f\u540d\u5185\u90e8\u7c7b\u4e0d\u518d\u6301\u6709 Activity\uff1a<\/p>\n
public class LeakAty extends Activity {\n\n  @Override\n  protected void onCreate(Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    setContentView(R.layout.aty_leak);\n    test();\n  }\n  \/\/\u52a0\u4e0astatic\uff0c\u53d8\u6210\u9759\u6001\u533f\u540d\u5185\u90e8\u7c7b\n  public static void test() {\n    new Thread(new Runnable() {\n      @Override\n      public void run() {\n        while (true) {\n          try {\n            Thread.sleep(1000);\n          } catch (InterruptedException e) {\n            e.printStackTrace();\n          }\n        }\n      }\n    }).start();\n  }\n}<\/code><\/pre>\n
Handler<\/h3>\n
public class LeakAty extends Activity {\n\n  @Override\n  protected void onCreate(Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    setContentView(R.layout.aty_leak);\n    fetchData();\n  }\n\n  private Handler mHandler = new Handler() {\n    public void handleMessage(android.os.Message msg) {\n      switch (msg.what) {\n      case 0:\n        \/\/ \u5237\u65b0\u6570\u636e\n        break;\n      default:\n        break;\n      }\n    };\n  };\n\n  private void fetchData() {\n    \/\/\u83b7\u53d6\u6570\u636e\n    mHandler.sendEmptyMessage(0);\n  }\n}<\/code><\/pre>\n
\u533f\u540d Handler \u4f1a\u5f15\u7528 LeakAty.this\uff1bActivity \u9000\u51fa\u65f6\u82e5\u8fd8\u6709\u6d88\u606f\u8981\u5904\u7406\uff0cActivity \u5c31\u4e0d\u4f1a\u88ab\u56de\u6536\u3002\u6b63\u786e\u5199\u6cd5\uff1a\u9759\u6001\u5185\u90e8\u7c7b + \u5f31\u5f15\u7528 + onDestroy \u6e05\u6d88\u606f\u3002<\/p>\n
public class LeakAty extends Activity {\n  private TextView tvResult;\n  private MyHandler handler;\n\n  @Override\n  protected void onCreate(Bundle savedInstanceState) {\n    super.onCreate(savedInstanceState);\n    setContentView(R.layout.aty_leak);\n    tvResult = (TextView) findViewById(R.id.tvResult);\n    handler = new MyHandler(this);\n    fetchData();\n  }\n  \/\/\u7b2c\u4e00\u6b65\uff0c\u5c06Handler\u6539\u6210\u9759\u6001\u5185\u90e8\u7c7b\u3002\n  private static class MyHandler extends Handler {\n    \/\/\u7b2c\u4e8c\u6b65\uff0c\u5c06\u9700\u8981\u5f15\u7528Activity\u7684\u5730\u65b9\uff0c\u6539\u6210\u5f31\u5f15\u7528\u3002\n    private WeakReference<LeakAty> atyInstance;\n    public MyHandler(LeakAty aty) {\n      this.atyInstance = new WeakReference<LeakAty>(aty);\n    }\n\n    @Override\n    public void handleMessage(Message msg) {\n      super.handleMessage(msg);\n      LeakAty aty = atyInstance == null ? null : atyInstance.get();\n      \/\/\u5982\u679cActivity\u88ab\u91ca\u653e\u56de\u6536\u4e86\uff0c\u5219\u4e0d\u5904\u7406\u8fd9\u4e9b\u6d88\u606f\n      if (aty == null || aty.isFinishing()) {\n        return;\n      }\n      aty.tvResult.setText("fetch data success");\n    }\n  }\n\n  private void fetchData() {\n    handler.sendEmptyMessage(0);\n  }\n\n  @Override\n  protected void onDestroy() {\n    \/\/\u7b2c\u4e09\u6b65\uff0c\u5728Activity\u9000\u51fa\u7684\u65f6\u5019\u79fb\u9664\u56de\u8c03\n    super.onDestroy();\n    handler.removeCallbacksAndMessages(null);\n  }\n}<\/code><\/pre>\n
\n
\u4e09\u3001\u8d44\u6e90\u672a\u5173\u95ed<\/span><\/h2>\n
\u7528\u4e86 BroadcastReceiver\u3001File\u3001Cursor\u3001Bitmap \u7b49\uff0c\u4e0d\u7528\u65f6\u8981\u53ca\u65f6\u91ca\u653e\uff0c\u5426\u5219\u6cc4\u6f0f\u3002<\/p>\n
\n
\u56db\u3001Adapter \u6ca1\u7528 convertView<\/span><\/h2>\n
ListView \u7684 BaseAdapter.getView(int position, View convertView, ViewGroup parent) \u7ed9\u6bcf\u4e00\u9879\u63d0\u4f9b View\u3002\u4e00\u5f00\u59cb\u6309\u5c4f\u5e55\u5b9e\u4f8b\u5316\u4e00\u6279\u5e76\u7f13\u5b58\uff1b\u5411\u4e0a\u6eda\u65f6\uff0c\u6700\u4e0a\u9762\u7684 item View \u88ab\u56de\u6536\uff0c\u62ff\u53bb\u6784\u9020\u65b0\u51fa\u73b0\u7684\u6700\u4e0b\u9762\u4e00\u9879\u3002convertView \u5c31\u662f\u7f13\u5b58\u4e0b\u6765\u7684\u90a3\u5757\uff08\u521d\u59cb\u5316\u6ca1\u6709\u7f13\u5b58\u65f6\u4e3a null\uff09\u3002\u6bcf\u6b21 getView \u90fd new \u4e00\u4e2a View\uff0c\u65e2\u6d6a\u8d39\u65f6\u95f4\uff0c\u4e5f\u5236\u9020\u5185\u5b58\u5783\u573e\uff0c\u56de\u6536\u8ddf\u4e0d\u4e0a\u5c31\u8feb\u4f7f VM \u518d\u7ed9\u8fdb\u7a0b\u52a0\u5185\u5b58\u3002<\/p>\n
\n
\u4e94\u3001\u4e0d\u826f\u4ee3\u7801\u9020\u6210\u5185\u5b58\u538b\u529b<\/span><\/h2>\n
\u6709\u4e9b\u4ee3\u7801\u4e0d\u4e00\u5b9a\u6cc4\u6f0f\uff0c\u4f46\u5bf9\u6ca1\u7528\u7684\u5185\u5b58\u91ca\u653e\u4e0d\u53ca\u65f6\uff0c\u6216\u9891\u7e41\u7533\u8bf7\u65b0\u5bf9\u8c61\uff0c\u540c\u6837\u4f1a\u628a VM \u538b\u9ad8\u3002Bitmap \u5c24\u5176\u8981\u6ce8\u610f\uff1a<\/p>\n
    \n
  • \n
    \u53ca\u65f6\u9500\u6bc1\uff1a\u7cfb\u7edf\u6700\u7ec8\u4f1a\u56de\u6536 Bitmap\uff0c\u4f46\u5360\u7528\u592a\u5927\u5bb9\u6613\u8d85 Java \u5806\u3002\u7528\u5b8c recycle\uff0c\u4e0d\u80fd\u4fdd\u8bc1\u7acb\u523b\u91ca\u653e\uff0c\u4f46\u4f1a\u63d0\u793a\u865a\u62df\u673a\u300c\u8fd9\u5f20\u56fe\u53ef\u4ee5\u653e\u4e86\u300d<\/section>\n<\/li>\n
  • \n
    \u8bbe\u91c7\u6837\u7387\uff1a\u663e\u793a\u533a\u57df\u5f88\u5c0f\u5c31\u4e0d\u5fc5\u52a0\u8f7d\u6574\u56fe\u3002inSampleSize = 2 \u65f6\u5bbd\u9ad8\u5404\u4e00\u534a\uff0c\u50cf\u7d20\u7ea6\u4e3a\u539f\u6765\u7684 1\/4<\/section>\n<\/li>\n<\/ul>\n
    private ImageView preview;\nBitmapFactory.Options options = new BitmapFactory.Options();\noptions.inSampleSize = 2;\/\/\u56fe\u7247\u5bbd\u9ad8\u90fd\u4e3a\u539f\u6765\u7684\u4e8c\u5206\u4e4b\u4e00\uff0c\u5373\u56fe\u7247\u4e3a\u539f\u6765\u7684\u56db\u5206\u4e4b\u4e00\nBitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri), null, options);\npreview.setImageBitmap(bitmap);<\/code><\/pre>\n
    \n
    \u516d\u3001\u6e05\u5355<\/span><\/h2>\n\n\n\n\n\n\n\n\n\n
    \u573a\u666f<\/th>\n\u505a\u6cd5<\/th>\n<\/tr>\n<\/thead>\n
    \u9759\u6001\u5355\u4f8b<\/td>\n\u7528 Application Context\uff0c\u6216\u5f31\u5f15\u7528<\/td>\n<\/tr>\n
    \u975e\u9759\u6001\u5185\u90e8\u7c7b \/ \u7ebf\u7a0b \/ Handler<\/td>\n\u6539\u9759\u6001 + \u5f31\u5f15\u7528\uff0conDestroy \u505c\u4efb\u52a1\u3001\u6e05\u6d88\u606f<\/td>\n<\/tr>\n
    Cursor \/ \u6587\u4ef6 \/ \u5e7f\u64ad \/ Bitmap<\/td>\n\u8c01\u521b\u5efa\u8c01\u5173\u95ed\uff0cActivity \u9500\u6bc1\u65f6\u6ce8\u9500<\/td>\n<\/tr>\n
    ListView Adapter<\/td>\n\u590d\u7528 convertView<\/td>\n<\/tr>\n
    \u5927\u56fe<\/td>\nrecycle + inSampleSize<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \n
    • \n
      \u5bf9 Activity \u7b49\u7ec4\u4ef6\u7684\u5f15\u7528\u5e94\u63a7\u5236\u5728\u5176\u751f\u547d\u5468\u671f\u5185\uff1b\u4e0d\u884c\u5c31 getApplicationContext \/ getApplication<\/section>\n<\/li>\n
    • \n
      \u5c3d\u91cf\u4e0d\u8981\u5728\u9759\u6001\u53d8\u91cf\u6216\u9759\u6001\u5185\u90e8\u7c7b\u91cc\u7528\u975e\u9759\u6001\u5916\u90e8\u6210\u5458\uff08\u542b context\uff09\uff1b\u8981\u7528\u5c31\u9002\u65f6\u7f6e\u7a7a\uff0c\u6216\u5f31\u5f15\u7528<\/section>\n<\/li>\n
    • \n
      \u751f\u547d\u5468\u671f\u6bd4 Activity \u957f\u7684\u5185\u90e8\u7c7b\uff1a\u6539\u9759\u6001\u5185\u90e8\u7c7b + \u5f31\u5f15\u7528\u5916\u90e8\u6210\u5458<\/section>\n<\/li>\n
    • \n
      Handler \u6301\u6709\u7684\u5bf9\u8c61\u7528\u5f31\u5f15\u7528\uff1bonStop \/ onDestroy \u53d6\u6d88 Message \u548c Runnable<\/section>\n<\/li>\n
    • \n
      \u4e0d\u7528\u7684\u5bf9\u8c61\u663e\u5f0f\u8d4b null\uff1bBitmap \u5148 recycle \u518d null\uff1b\u6570\u7ec4 clear \u540e null\uff1b\u8c01\u521b\u5efa\u8c01\u91ca\u653e<\/section>\n<\/li>\n
    • \n
      BroadcastReceiver\u3001ContentObserver\u3001File\u3001Cursor\u3001Stream\u3001Bitmap \u5728\u9500\u6bc1\u65f6\u5173\u95ed\u6216\u6ce8\u9500<\/section>\n<\/li>\n
    • \n
      \u5bf9\u5355\u4f8b\u3001\u9759\u6001\u5bf9\u8c61\u3001\u5168\u5c40\u96c6\u5408\u7684\u751f\u547d\u5468\u671f\u4fdd\u6301\u654f\u611f<\/section>\n<\/li>\n<\/ul>\n
      \n
      \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u6cc4\u6f0f\u51e0\u4e4e\u90fd\u662f\u300c\u77ed\u547d\u5bf9\u8c61\u88ab\u957f\u547d\u5f15\u7528\u6293\u4f4f\u300d\uff1a\u5355\u4f8b\u7528 Application\u3001\u5185\u90e8\u7c7b\u6539\u9759\u6001\u52a0\u5f31\u5f15\u7528\u3001\u8d44\u6e90\u7528\u5b8c\u5c31\u5173\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
      \u5185\u5b58\u6cc4\u6f0f\uff1a\u5bf9\u8c61\u5df2\u7ecf\u4e0d\u7528\u4e86\uff0c\u5374\u88ab\u522b\u7684\u5bf9\u8c61\u8fd8\u63e1\u7740\u5f15\u7528\uff0c\u5185\u5b58\u6536\u4e0d\u56de\u53bb\u3002\u6162\u6162\u5806\u79ef\u6700\u7ec8 OOM\u3002\u5199\u4ee3\u7801\u65f6\u5c31\u8981\u907f\u5f00\u8fd9\u7c7b\u5199\u6cd5 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[45],"tags":[77],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1358"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1358"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1358\/revisions"}],"predecessor-version":[{"id":1377,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1358\/revisions\/1377"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}