android手机编程10.2.2
新建个项目，修改activity_main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="change_text"
android:id="@+id/change_text" />
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
修改mainactivity.javapackage com.example.xinwei.androidthreadtest;
import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
public static final int UPDATE_TEXT=1;
private static TextView text;
@SuppressLint("HandlerLeak")
private static Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case UPDATE_TEXT:
text.setText("Nice to meet you");
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text=(TextView)findViewById(R.id.text);
Button changeText=(Button)findViewById(R.id.change_text);
changeText.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.change_text:
new Thread(){
@Override
public void run() {
Message message=new Message();
message.what=UPDATE_TEXT;
handler.sendMessage(message);
}
}.start();
break;
default:
break;
}
}
}
这种方法一般很少用，一般都是直接在线程里用runOnUIThread方法来更新ui 这种才是常用的
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