Intent (whether there is return value to jump)

startActivity(),startActivityForResult() The two methods determine whether there is page Jump with data return

public class MainActivity extends ActionBarActivity {
	Button bt1;
	Button bt2;
	TextView tv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		bt1=(Button) findViewById(R.id.button1);
		bt2=(Button) findViewById(R.id.button2);
		tv=(TextView) findViewById(R.id.textView1);
		bt1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent intent=new Intent(MainActivity.this,second.class);
				startActivity(intent);
			}
		});
		bt2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent intent=new Intent(MainActivity.this,second.class);
				startActivityForResult(intent, 1);//1 Is to set the identity of the request 
				
			}
		});
	}
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		//requestCode: Identification of the request 
		//resultCode: The identity returned 
		super.onActivityResult(requestCode, resultCode, data);
		if(requestCode==1&&resultCode==2)
		{
			String content=data.getStringExtra("data");// Receive the returned data 
			tv.setText(content);
		}
	}

}

The corresponding layout file

<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:orientation="vertical"
    tools:context="com.example.xin.intent.MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="17dp"
        android:text=" First method jump " />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/button1"
        android:text=" Jump that can return data " />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/button2"
        android:layout_below="@+id/button2"
        android:layout_marginTop="18dp"
        android:text="TextView" />

</LinearLayout>

the second Activity

public class second extends Activity{
Button bt;
String content=" Hello , I am the data returned by page 2 ";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		bt=(Button) findViewById(R.id.button);
		bt.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent intent=new Intent();
				intent.putExtra("data", content);
				setResult(2, intent);
				finish();
			}
		});
	}
}

The corresponding layout file

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

    <Button
        android:id="@+id/button"
        android:layout_width="306dp"
        android:layout_height="wrap_content"
        android:text=" Return the data " />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="135dp"
        android:text=" Page 2 " />

</RelativeLayout>