Android--Activity在跳转时携带数据

Posted 2020-06-30 chaoyu168

首先看看两种传递方法示例：（一个简单姻缘计算器）

主Activity

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    public void click(View v){
    	Intent intent = new Intent(this, SecondActivity.class);
    	//把数据封装至intent对象中
//    	intent.putExtra("malename", "张三");
//    	intent.putExtra("femalename", "芙蓉姐姐");
    	
    	//把数据封装至bundle对象中
    	Bundle bundle = new Bundle();
    	bundle.putString("malename", "<span style="font-family: Arial, Helvetica, sans-serif;">张三</span>"<span style="font-family: Arial, Helvetica, sans-serif;">);</span>
    	bundle.putString("femalename", "芙蓉姐姐");
    	
    	//把bundle对象封装至intent对象中
    	intent.putExtras(bundle);
    	startActivity(intent);
    }
    
}

import java.util.Random;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_second);
		
		Intent intent = getIntent();
		//从intent对象中把封装好的数据取出来
//		String maleName = intent.getStringExtra("malename");
//		String feMaleName = intent.getStringExtra("femalename");
		
		Bundle bundle = intent.getExtras();
		String maleName = bundle.getString("malename");
		String feMaleName = bundle.getString("femalename");
		
		Random rd = new Random();
		int yinyuan = rd.nextInt(100);
		
		TextView tv = (TextView) findViewById(R.id.tv);
		tv.setText(maleName + "和" + feMaleName + "的姻缘值为" + yinyuan);
	}
}

activity_main.xml:

<LinearLayout 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=".MainActivity" 
    android:orientation="vertical"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="这是姻缘计算器，很准的哟" />

    <EditText 
        android:id="@+id/et_malename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="张三"
        />
    <EditText 
        android:id="@+id/et_femalename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="芙蓉姐姐"
        />
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="计算"
        android:onClick="click"
        />
</LinearLayout>

activity_second.xml：

<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=".MainActivity" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="这是第二个Activity" />

</RelativeLayout>