Android studio-Activity中的数据传递

1.在使用新浪微博APP时，能发现在微博发布页面进入图库选择图片后，会回到微博发布页面并带回了图片选择页面的图片信息。这个功能的实现利用了Activity回传数据。

– Andorid提供了一个startActivityForResult()方法，来实现回传数据。startActivityForResult()方法接收两个参数，第一个参数是Intent，第二个参数用于判断数据的来源。

数据代码：

activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_gravity="center"
tools:context=".MainActivity">
    <ImageView
        android:id="@+id/pet_imgv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="30dp"
        android:src="@drawable/baby" />
    <TextView
        android:id="@+id/pet_dialog_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="25dp"
        android:gravity="center"
        android:text="主人，快给小宝宝购买装备吧" />
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="20dp" >
<TableRow
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
    <TextView
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="生命值:"
        android:textColor="@android:color/black"
        android:textSize="14sp" />
    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="2" />

    <TextView
        android:id="@+id/tv_life_progress"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="0"
        android:gravity="center"
        android:textColor="#000000" />
</TableRow>
<TableRow
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="攻击力:"
        android:textColor="@android:color/black"
        android:textSize="14sp" />

    <ProgressBar
        android:id="@+id/progressBar2"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="2" />

    <TextView
        android:id="@+id/tv_attack_progress"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="0"
        android:gravity="center"
        android:textColor="#000000" />
</TableRow>
<TableRow
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="敏捷:"
        android:textColor="@android:color/black"
        android:textSize="14sp" />

    <ProgressBar
        android:id="@+id/progressBar3"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="2" />

    <TextView
        android:id="@+id/tv_speed_progress"
        android:layout_width="0dip"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="0"
        android:gravity="center"
        android:textColor="#000000" />
</TableRow>
</TableLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<Button
    android:id="@+id/btn_baby"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:drawableRight="@android:drawable/ic_menu_add"
    android:onClick="click"
    android:drawablePadding="3dp"
    android:text="小宝宝购买装备"
    android:textSize="14sp" />
</RelativeLayout>

</LinearLayout>

activity_shop.xml代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <View
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@android:drawable/ic_menu_info_details"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        />
    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="60dp"
        android:text="商品名称"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv_life"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="生命值"/>
        <TextView
            android:id="@+id/tv_attack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="攻击力"/>
        <TextView
            android:id="@+id/tv_speed"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="速度"/>
    </LinearLayout>

</RelativeLayout>

MainActivity.java数据代码

package com.example.yuekang.demo3_datareturn;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity {

    private ProgressBar mProgressBar1;//用到的进度条均需要设置变量名
    private ProgressBar mProgressBar2;
    private ProgressBar mProgressBar3;
    //用到的生命值以及攻击力，速度
    private TextView mLifeTV;
    private TextView mAttackTV;
    private TextView mSpeedTV;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);//讲xml文件同Java文件关联起来
        mLifeTV = (TextView) findViewById(R.id.tv_life_progress);//关联生命值
        mAttackTV = (TextView) findViewById(R.id.tv_attack_progress);//攻击力
        mSpeedTV = (TextView) findViewById(R.id.tv_speed_progress);//速度
        initProgress(); //初始化进度条
    }

    public void click(View view){
        Intent intent = new Intent(this,ShopActivity.class);//点击按钮的时候需要打开ShopActivty.class
        startActivityForResult(intent, 1);//打开拿出来的结果,也就是说去了ShopActivity去拿结果在，这里用1来标识
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {//数据拿回来需要一个判断
        super.onActivityResult(requestCode, resultCode, data);
        if(data!=null){//拿回来的数据不为空
            if(resultCode==1){
                if(requestCode==1){
                    ItemInfo info = (ItemInfo)data.getSerializableExtra("equipment");//武器的相关信息
                    updateProgress(info);//更新进度条
                }
            }
        }

    }

    private void initProgress() {//对于进度条而言，不仅仅要设置初始值，还要设置一个最大值
        mProgressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
        mProgressBar2 = (ProgressBar) findViewById(R.id.progressBar2);
        mProgressBar3 = (ProgressBar) findViewById(R.id.progressBar3);
        mProgressBar1.setMax(1000);        //设置最大值ֵ1000
        mProgressBar2.setMax(1000);
        mProgressBar3.setMax(1000);
    }

    //更新ProgressBar的值
    private void updateProgress(ItemInfo info) {
        int progress1 = mProgressBar1.getProgress();
        int progress2 = mProgressBar2.getProgress();
        int progress3 = mProgressBar3.getProgress();
        mProgressBar1.setProgress(progress1+info.getLife());
        mProgressBar2.setProgress(progress2+info.getAcctack());
        mProgressBar3.setProgress(progress3+info.getSpeed());
        mLifeTV.setText(mProgressBar1.getProgress()+"");
        mAttackTV.setText(mProgressBar2.getProgress()+"");
        mSpeedTV.setText(mProgressBar3.getProgress()+"");
    }
}

ItemInfo.java数据代码

package com.example.yuekang.demo3_datareturn;
//实体类
import java.io.Serializable;

public class ItemInfo implements Serializable {
    private String name;  //装备的名字
    private int acctack;//装备的攻击力
    private int life;//装备的生命值
    private int speed;//装备的速度
    public ItemInfo(String name, int acctack, int life, int speed) {
        this.name = name;
        this.acctack = acctack;
        this.life = life;
        this.speed = speed;
    }
    //四个get()set()方法
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAcctack() {
        return acctack;
    }
    public void setAcctack(int acctack) {
        this.acctack = acctack;
    }
    public int getLife() {
        return life;
    }
    public void setLife(int life) {
        this.life = life;
    }
    public int getSpeed() {
        return speed;
    }
    public void setSpeed(int speed) {
        this.speed = speed;
    }
    public String toString() {
        return " [name=" + name + ", acctack=" + acctack + ", life=" + life
                + ", speed=" + speed + "]";
    }
}

shopActivity.java数据代码

package com.example.yuekang.demo3_datareturn;

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

public class ShopActivity extends Activity implements View.OnClickListener {//实现接口
    private ItemInfo itemInfo;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shop);
        itemInfo = new ItemInfo("金剑", 100, 20, 20);

        TextView mLifeTV = (TextView) findViewById(R.id.tv_life);
        TextView mNameTV = (TextView) findViewById(R.id.tv_name);
        TextView mSpeedTV = (TextView) findViewById(R.id.tv_speed);
        TextView mAttackTV = (TextView) findViewById(R.id.tv_attack);

        mLifeTV.setText("生命值" + itemInfo.getLife());
        mNameTV.setText(itemInfo.getName() + "");
        mSpeedTV.setText("敏捷度" + itemInfo.getSpeed());
        mAttackTV.setText("攻击力" + itemInfo.getAcctack());
        //武器被选择的时候
        findViewById(R.id.rl).setOnClickListener(this);//需要事件触发，此处的this是指Activity_shop
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.rl:
            Intent intent=new Intent();
            intent.putExtra("equipment",itemInfo);//将金剑的信息传进来
                setResult(1,intent);
                finish();
                break;
        }

    }


}

Mainifest.xml数据代码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yuekang.demo3_datareturn">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.example.yuekang.demo3_datareturn.ShopActivity"
            android:label="@string/app_name">

        </activity>
    </application>

</manifest>

数据结果

Android studio-Activity中的数据传递

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