\n1)\u51b3\u5b9a\u8de8\u7ebf\u7a0b\u7684\u662fLooper\u7c7b\uff0c\u53ea\u6709Looper\u4e0e\u7ebf\u7a0b\u76f8\u5173\u3002<\/strong>
\n2)Handler\u7c7b\u53ea\u662f\u6700\u9876\u5c42\u7684\u4e00\u4e2a\u63a5\u53e3\uff0c\u8d1f\u8d23\u4e0eLooper\u7684\u6d88\u606f\u961f\u5217\u4ea4\u4e92\u3002Handler\u4e0e\u7ebf\u7a0b\u65e0\u5173<\/strong>
\n![\"\"](\"http:\/\/xinyiworld.top\/wordpress_it\/wp-content\/uploads\/2021\/09\/18328858-bdaac3701921a89d.png\")
<\/p>\n<\/blockquote>\n<\/span>4.\u9519\u8bef\u7684\u7406\u89e3Handler<\/span><\/h2>\n\u4e00\u822cHandler\u5728Activity\uff08\u4e3b\u7ebf\u7a0b\uff09\u91cc\u76f4\u63a5new\uff0c\u5728\u5b50\u7ebf\u7a0b\u91cc\u8981\u5f00\u542fLooper.prepare\uff0c\u7136\u540e\u518dnew Handler\u3002
\n\u6240\u4ee5\u4e0d\u77e5\u4e0d\u89c9\u6211\u5c31\u5f62\u6210\u4e86\u4e00\u79cd\u9519\u89c9\uff1aHandler\u5728\u54ea\u4e2a\u7ebf\u7a0b\u91ccnew\u7684\uff0c\u5b83\u7684\u6d88\u606f\u5c31\u4f1a\u5206\u53d1\u5230\u54ea\u4e2a\u7ebf\u7a0b\u3002<\/del>
\n\u5e26\u7740\u8fd9\u4e2a\u201c\u9519\u89c9\u201d\uff0c\u7136\u540e\u53bb\u4e86\u5c0f\u7c73\u9762\u8bd5\uff0c\u9762\u8bd5\u5b98\u5c31\u63d0\u51fa\u4e86\u95ee\u9898\uff1a\u5982\u679c\u5728\u4e3b\u7ebf\u7a0b\u91cc\u521b\u5efaHandler\uff0c\u7136\u540e\u4f7f\u7528\u5b50\u7ebf\u7a0b\u7684Loopper\u5462\uff1f<\/strong>
\n\u786e\u5b9e\uff0cHandler\u6709\u4e2a\u5e26Looper\u7684\u6784\u9020\u65b9\u6cd5\uff1a<\/p>\n\/**\n * Use the provided {@link Looper} instead of the default one.\n * @param looper The looper, must not be null.\n *\/\n public Handler(@NonNull Looper looper) {\n this(looper, null, false);\n }<\/code><\/pre>\n\u770b\u6ce8\u91ca\u91cc\u201cthe default one\u201d\uff0c\u786e\u5b9a\uff0c\u5982\u679c\u6211new\u65e0\u53c2\u7684Handler\uff0c\u201cthe default one\u201d\u5c31\u662f\u7ebf\u7a0b\u5df2\u7ecf\u7ed1\u5b9a\u597d\u7684Looper\u3002\u6240\u4ee5\u6211\u7684\u9519\u89c9\u201cHandler\u5728\u54ea\u4e2a\u7ebf\u7a0b\u91ccnew\u7684\uff0c\u5b83\u7684\u6d88\u606f\u5c31\u4f1a\u5206\u53d1\u5230\u54ea\u4e2a\u7ebf\u7a0b\u3002<\/del>\u201d\u5982\u679c\u52a0\u4e0a\u4e00\u4e2a\u9650\u5b9a\uff0c\u5c31\u662fnew\u8c03\u7528\u7684\u662fHandler\u7684\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\u5c31\u6ca1\u5565\u6bdb\u75c5\u4e86\u3002<\/p>\n<\/span>\u9a8c\u8bc1\u5e26\u53c2Handler<\/span><\/h3>\n\u9996\u5148\u5b9a\u4e49\u4e00\u4e2a\u5b50\u7ebf\u7a0b<\/p>\n
public class TestThread extends Thread {\n private static final String TAG = "TestThread";\n private OnLooperPreparedListener onLooperPreparedListener;\n\n public TestThread(OnLooperPreparedListener onLooperPreparedListener) {\n this.onLooperPreparedListener = onLooperPreparedListener;\n }\n\n @Override\n public void run() {\n super.run();\n Log.e(TAG, "TestThread name : " + getName());\n Looper.prepare();\n if(onLooperPreparedListener != null){\n onLooperPreparedListener.onLooperPrepare(Looper.myLooper());\n }\n Looper.loop();\n }\n\n public interface OnLooperPreparedListener{\n void onLooperPrepare(Looper looper);\n }\n}<\/code><\/pre>\n\u5728activity\u91cc\u8c03\u7528<\/p>\n
public class HandlerTestActivity extends AppCompatActivity {\n private static final String TAG = "HandlerTestActivity";\n private class MyCallBack implements Handler.Callback{\n @Override\n public boolean handleMessage(@NonNull Message msg) {\n Log.e(TAG, "handleMessage: " + msg.what + "," + Thread.currentThread().getName());\n return false;\n }\n }\n\n @Override\n protected void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(R.layout.activity_handler_test);\n\n TestThread thread = new TestThread(new TestThread.OnLooperPreparedListener() {\n @Override\n public void onLooperPrepare(Looper looper) {\n Handler handler = new Handler(looper,new MyCallBack());\n handler.sendEmptyMessage(0);\n }\n });\n thread.start();\n }\n}<\/code><\/pre>\n\u8f93\u51fa\u65e5\u5fd7<\/p>\n
TestThread: TestThread name : Thread-2766\nHandlerTestActivity: handleMessage: 0,Thread-2766<\/code><\/pre>\nHandler\u7684\u5904\u7406\u786e\u5b9e\u662f\u5728\u5b50\u7ebf\u7a0b\u3002
\n\u597d\u5427\uff0c\u5230\u8fd9\u91cc\u81ea\u5df1\u6253\u81ea\u5df1\u8138\u4e86\u3002\u6240\u4ee5\uff0c\u79d1\u5b66\u8981\u4e25\u8c28\uff0c\u8981\u591a\u505a\u9a8c\u8bc1\u6d4b\u8bd5\u3002<\/strong><\/p>\n