android studio 更新ui的四种方式 handler

更新ui的四种方式：getactivity.runonuithread;handler.post;handler.sendmessage;view post

handler.post:

public class Main3Activity extends AppCompatActivity {
TextView textView;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
textView=(TextView)findViewById(R.id.text3);
new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(1000);
handler.post(new Runnable() {
@Override
public void run() {
textView.setText("ok");
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}.start();
}
}

handler.sendmessage:

public class Main3Activity extends AppCompatActivity {
TextView textView;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
textView.setText("ok 2");
}
};
public void handler2(){
handler.sendEmptyMessage(1);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
textView=(TextView)findViewById(R.id.text3);
new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(1000);
handler2();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}.start();
}

}

public class Main3Activity extends AppCompatActivity {
TextView textView;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

}
};
private void updateUI(){
runOnUiThread(new Runnable() {
@Override
public void run() {

}
});
}
public void handler2(){
handler.sendEmptyMessage(1);
}
private void viewUI(){
textView.post(new Runnable() {
@Override
public void run() {
textView.setText("ok 2");
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
textView=(TextView)findViewById(R.id.text3);
new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(1000);
viewUI();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}.start();
}
public void handler1(){
handler.post(new Runnable() {
@Override
public void run() {
textView.setText("ok");
}
});
}
}