StartActivityforresutl 数据传递

最新推荐文章于 2022-08-27 22:03:01 发布

原创最新推荐文章于 2022-08-27 22:03:01 发布 · 679 阅读

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#StartActivityforresu #数据传递 #android

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本文详细介绍了如何在Android应用中实现从MainActivity到ActivityB的数据传递，并通过ActivityB回传数据到MainActivity，包括定义关键常量、布局文件以及事件监听机制。

MainActivity:

package com.example.startactivityforresutl;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;


public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		
		final Activity activity = this;
		Button button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				Intent intent = new Intent(activity,ActivityB.class);
				intent.putExtra(Contents.MainActivity_KEY, "hello ! I am from MainActivity!");
				
				startActivityForResult(intent,Contents.request_code);
			}
		});
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		
		super.onActivityResult(requestCode, resultCode, data);
		
		Log.d(this.getClass().getName()+":onActivityResult","requestCode:"+requestCode+"  resultCode:"+resultCode);
		Log.d(this.getClass().getName()+" :onActivityResult", data.getStringExtra(Contents.ActivityB_KEY));
	}
	
}

activity_main.xml布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.startactivityforresutl.MainActivity" >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="60dp"
        android:layout_marginTop="90dp"
        android:text="启动ActivityB" />
    
    
</RelativeLayout>

ActivityB：

package com.example.startactivityforresutl;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class ActivityB extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_b);
	
		Intent intent = this.getIntent();
		String s = intent.getStringExtra(Contents.MainActivity_KEY);
		Log.d("ActivityB输出", s);
		
		final Activity activity = this;
		Button button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(activity,MainActivity.class);
				intent.putExtra(Contents.ActivityB_KEY,"hello ! I am form Activtiy B ！" );
				
				activity.setResult(Contents.result_code,intent);
				activity.finish();
				
			}
		});	
	}
}

activity_b.xml布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.startactvityforresutl.MainActivity" >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="60dp"
        android:layout_marginTop="90dp"
        android:text="返回MainActivity" />

</RelativeLayout>

Contents：

package com.example.startactivityforresutl;

public class Contents {
	
	public	static	final	String	MainActivity_KEY="key";
	
	public	static	final	String	ActivityB_KEY="key";
	
	public	static	final	int	request_code=9;
	public	static	final	int	result_code=10;
}

AndroidManiFest.xml权限：

  <activity
            android:name=".ActivityB"
            android:label="B" >
        </activity>