<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mycompany.myapp" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity2">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button2"/>
</LinearLayout>
package com.mycompany.myapp;
import android.app.Activity;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.*;
import android.view.*;
import android.content.*;
public class MainActivity extends AppCompatActivity {
private Button bt1;
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt1=(Button) findViewById(R.id.button);
bt1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this,MainActivity2.class);
startActivity(intent);
}
});
}
@Override
protected void onActivityResult(int requestCode,int resultCode ,Intent data){
super.onActivityResult(requestCode,resultCode,data);
if(requestCode==1&&resultCode==2){
String content=data.getStringExtra("data");
tv.setText(content);
}
}
}
package com.mycompany.myapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity2 extends Activity
{
private Button bt;
String content="你好";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
bt = (Button) findViewById(R.id.button2);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view)
{
Intent data = new Intent();
data.putExtra("data", content);
setResult(2, data);
finish();
}
});
}
}