android studio的Handler简单实例代码
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实现：EditText输入消息，通过按钮选择发送给主线程或者子线程；
以下有效果图、MainActivity.java代码和activity_main.xml代码
效果图：
MainActivity.java代码
package huan.san.handleroneapp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public static final String TAG = "MainActivity";
private TextView mTextView1;
private TextView mTextView2;
private Button mButton1;
private Button mButton2;
private Handler1 mSubThreadHandler;
private Handler2 mMainThreadHandler;
private EditText mEditText;
String sMessage;
private int counter = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
public void init() {
mTextView1 = (TextView)findViewById(R.id.textView1);
mTextView2 = (TextView)findViewById(R.id.textView2);
mButton1 = (Button) findViewById(R.id.button1);
mButton2 = (Button) findViewById(R.id.button2);
mEditText = (EditText)findViewById(R.id.editTextTextPersonName) ;
mButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sMessage=mEditText.getText().toString();
//主线程发送消息到子线程
mSubThreadHandler = new Handler1(getMainLooper());
Message message = new Message();
message.obj = sMessage;
mSubThreadHandler.sendMessage(message);
}
});
mButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sMessage=mEditText.getText().toString();
//子线程发送消息到主线程
mMainThreadHandler = new Handler2(getMainLooper());
Message message = new Message();
message.obj = sMessage;
mMainThreadHandler.sendMessage(message);
}
});
new Thread(){
public void run(){
Looper.prepare();
//Looper.myLooper()获取当前线程的looper
mSubThreadHandler = new Handler1(Looper.myLooper());
Message message = new Message();
message.obj = sMessage;
};
}.start();
}
public class Handler1 extends Handler{
private Handler1(Looper looper){
super(looper);
}
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
//子线程消息显示
mTextView2.setText("子线程收到：" + msg.obj);
}
}
public class Handler2 extends Handler{
private Handler2(Looper looper){
super(looper);
}
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
//主线程消息显示
mTextView1.setText("主线程收到：" + msg.obj);
}
}
}
activity_main.xml代码
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="60dp"
android:layout_marginTop="140dp"
android:text="主线程发送消息"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="220dp"
android:layout_marginTop="140dp"
android:text="子线程发送消息"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView2"
android:layout_width="137dp"
android:layout_height="97dp"
android:layout_marginStart="220dp"
android:layout_marginTop="216dp"
android:text="没有收到消息"
android:textSize="20sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView1"
android:layout_width="139dp"
android:layout_height="94dp"
android:layout_marginStart="60dp"
android:layout_marginTop="216dp"
android:text="没有收到消息"
android:textSize="20sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editTextTextPersonName"
android:layout_width="200dp"
android:layout_height="51dp"
android:layout_marginStart="104dp"
android:layout_marginTop="64dp"
android:ems="10"
android:inputType="textPersonName"
android:text="请输入"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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