Activity跳转,startActivity和startActivityForResult之间的区别

startActivity(intent)：只是从当前活动界面跳转到另外一个界面，两个界面中不再有联系。

startActiivityForResult(requestcode,intnet):可以经当前活动界面认为是一个父窗体，要跳转的界面为子窗体，当子窗体关闭时，父窗体会执行onActivityResult()方法，并可以获取子窗体的返回值.

详细代码:

package net.lazyer.ActivityTest;

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

/*
 * create date：2010-12-13
 * auther:huhqian
 * description:联系Activity之间的跳转*/

public class ActivityTestMain extends Activity {
   
    
    private Button btnToSubActivity=null;
    private Button btnToOtherActivity=null;
    private TextView txtInfo=null;
    static int REQUEST_OK=1;

     /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        FindViewByID();
        //为按钮添加监听对象
        btnToOtherActivity.setOnClickListener(setBtnListener);
        btnToSubActivity.setOnClickListener(setBtnListener);
    }
    
    //获取layout中的定义的控件
    private void FindViewByID(){
        btnToOtherActivity=(Button)findViewById(R.id.btnToOtherActivity);
        btnToSubActivity=(Button)findViewById(R.id.btnToSubActivity);
        txtInfo=(TextView)findViewById(R.id.txtInfo);
    }
    
    
    //定义按钮的监听对象
    private OnClickListener setBtnListener=new OnClickListener(){
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent mIntent=new Intent();
            switch (v.getId()) {
            case R.id.btnToOtherActivity:
                //直接跳转到其他界面
                mIntent.setClass(ActivityTestMain.this,OtherActivity.class);
                startActivity(mIntent);
                break;
            default:
                mIntent.setClass(ActivityTestMain.this,SubActivity.class);
                startActivityForResult(mIntent,REQUEST_OK);
                break;
            }
        }
    };

    // 当SubActivity界面关闭时，执行该方法
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==REQUEST_OK){
            if(resultCode==REQUEST_OK){
                Bundle mBundle=data.getExtras();
                if(mBundle!=null)
                    txtInfo.setText(mBundle.getString("activityInfo"));
            }
        }
    }
}

该类文件对应的main.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:id="@+id/txtInfo"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="hello,this is AcitvityTestMain"
    />
<Button
    android:id="@+id/btnToSubActivity"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="to subActivity"
/>
<Button
    android:id="@+id/btnToOtherActivity"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="to OtherActivity"
/>    
</LinearLayout>

OtherActivity.java,与ActivityMain.java同级的活动界面:

package net.lazyer.ActivityTest;

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

public class OtherActivity  extends Activity{

    private Button btnClosed=null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        //加载相应的界面
        setContentView(R.layout.otheractivity);
        FindViewByID();
        btnClosed.setOnClickListener(setBtnListener);
        
    }
    
    private void FindViewByID(){
        btnClosed=(Button)findViewById(R.id.btnClose);
    }
    
    private OnClickListener setBtnListener=new OnClickListener(){
        public void onClick(View v){
            Intent mIntent=new Intent(OtherActivity.this,ActivityTestMain.class);
            startActivity(mIntent);
        }
    };

}

对应的otheractivity.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
<TextView
    android:id="@+id/txtOhterInfo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="this is otherActivity"
/>
<Button
    android:id="@+id/btnClose"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="closed"
/>
</LinearLayout>

SubActivity.java,ActivityTestMain.java的子界面

package net.lazyer.ActivityTest;

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

public class SubActivity extends Activity{
    
    private Button btnBack=null;
    private TextView txtInfo=null;
    static int RESULT_CODE=1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.subactivity);
        FindViewByID();
        btnBack.setOnClickListener(setBtnListener);
    }
    
    private void FindViewByID(){
        btnBack=(Button)findViewById(R.id.btnBack);
        txtInfo=(TextView)findViewById(R.id.txtSubInfo);
    }
    
    private OnClickListener setBtnListener=new OnClickListener(){
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent mIntent=new Intent();
            Bundle mBundle=new Bundle();
            mBundle.putString("activityInfo", txtInfo.getText().toString());
            mIntent.putExtras(mBundle);
            setResult(RESULT_CODE, mIntent);
            finish();
        }
    };

}

对应的subactivity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content">
 <TextView
     android:id="@+id/txtSubInfo"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="this is subActivity"
 />
 <Button
     android:id="@+id/btnBack"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="Back"
 />
</LinearLayout>

 

 

 

 

http://blog.csdn.net/huhqian/article/details/6074377