Toast是可以在非UI线程显示的,请看如下代码(包含在子线程创建Handler)
public class MainActivity extends AppCompatActivity {
private Handler subHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(MainActivity.this, "MainActivity :" + Thread.currentThread().getName(), Toast.LENGTH_SHORT).show();
new Thread() {
@Override
public void run() {
Looper.prepare();
subHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
Toast.makeText(MainActivity.this, "subHandler :" + Thread.currentThread().getName(), Toast.LENGTH_SHORT).show();
subHandler.sendEmptyMessageDelayed(0, 4000);
}
};
subHandler.sendEmptyMessageDelayed(0, 3000);
Looper.loop();
}
}.start();
}
}
分别弹出Toast MainActivit :main和subHandler :Thread-3456(此为线程ID,随机值)
所以Toast是可以在非UI线程显示的
