Android 像另一個Activity取返回值, implements OnClickListener, switch, startActivityForResult, Intent

returntest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
       <activity

            android:name=".TestActivity"
            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=".TestActivityReturn"></activity>
    </application>
</manifest>

TestActivity.java

package com.example.administrator.test;

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

/**
 * Created by Administrator on 2014/10/10.
 */
public class TestActivity extends Activity implements View.OnClickListener {
    private TextView mTextView1, mTextView2;
    private Button mButton1, mButton2;
    private int flag;
    private Intent intent;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testactivity);

        mTextView1 = (TextView) findViewById(R.id.myTextView1);
        mTextView2 = (TextView) findViewById(R.id.myTextView2);
        mButton1 = (Button) findViewById(R.id.myButton1);
        mButton2 = (Button) findViewById(R.id.myButton2);

        mButton1.setOnClickListener(this);
        mButton2.setOnClickListener(this);

        intent = new Intent();
        intent.setClass(TestActivity.this, TestActivityReturn.class);

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.myButton1:
                flag = 0;
                startActivityForResult(intent, 1);
                break;
            case R.id.myButton2:
                flag = 2;
                startActivityForResult(intent, 1);
                break;
            default:
                break;
        }
    }

    /* 從第二頁面返回時, 執行此方法 */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        String str1 = intent.getStringExtra("change01");
        String str2 = intent.getStringExtra("change02");

        switch (flag) {
            case 0:
                mTextView1.setText(str1);
                break;
            case 2:
                mTextView2.setText(str2);
                break;
            default:
                break;
        }
    }
}

testactivity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一行的值"
        android:id="@+id/myTextView1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第二行的值"
        android:id="@+id/myTextView2" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="改變第一行"
            android:id="@+id/myButton1" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="改變第二行"
            android:id="@+id/myButton2" />
    </LinearLayout>
</LinearLayout>

TestActivityReturn.java

package com.example.administrator.test;

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

/**
 * Created by Administrator on 2014/10/10.
 */
public class TestActivityReturn extends Activity {
    private TextView mTextView;
    private Button mButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.returntest);

        mTextView = (TextView) findViewById(R.id.myTextView);
        mButton = (Button) findViewById(R.id.myButton);

        mTextView.setText("沒事做!!!!");
        mButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.putExtra("change01", "你好, 我好, 大家好, 按鈕1");
                intent.putExtra("change02", "中國一定強, 按鈕2");
                setResult(1, intent);
                finish();
            }
        });

    }
}