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 stubIntent 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@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubsuper.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" ><TextViewandroid:id="@+id/txtInfo" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="hello,this is AcitvityTestMain" /><Buttonandroid:id="@+id/btnToSubActivity"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="to subActivity"/><Buttonandroid: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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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"><TextViewandroid:id="@+id/txtOhterInfo"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="this is otherActivity"/><Buttonandroid: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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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 stubIntent 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>