今天回顧下handler 記錄一個延時的demo

使用 postDelayed 主要代碼如下：

public class MainActivity extends AppCompatActivity {private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);handler = new Handler();handler.postDelayed(new Runnable() {@Overridepublic void run() {Toast.makeText(MainActivity.this, "延遲5s", Toast.LENGTH_SHORT).show();}},5000);}@Overrideprotected void onDestroy() {super.onDestroy();if (handler != null) {handler.removeCallbacksAndMessages(null);handler = null;}}
}

或者

public class MainActivity extends AppCompatActivity {private Handler handler;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);handler = new Handler();Runnable runnable = new Runnable() {@Overridepublic void run() {Toast.makeText(MainActivity.this, "延時5s", Toast.LENGTH_SHORT).show();}};// 延遲5s彈Toasathandler.postDelayed(runnable,5000);}@Overrideprotected void onDestroy() {super.onDestroy();if (handler != null) {handler.removeCallbacksAndMessages(null);handler = null;}}
}

?

總結

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