在activity之间传递intent

step 1. 创建一个新的activity

step 2. 向AndroidManifest.xml的application中添加一个activity

 <activity android:name=".Android_SecondActivity"
                  android:label="@string/app_name">
           
  </activity>

step 3. 为新的activity创建layout xml文件 second.xml

<?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/myView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/secondActiviy"
    />
</LinearLayout>

step 4. 实现第一个activity

package com.example.michael;

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 Android_FirstActivity extends Activity {
	
	private Button button = null;
	
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button)findViewById(R.id.myButton);
        button.setOnClickListener( new MyButtonListener());
    }
    
    class MyButtonListener implements OnClickListener{

    	@Override
    	public void onClick(View v) {
    		// TODO Auto-generated method stub
    		 Intent intent = new Intent();
    		 intent.setClass(Android_FirstActivity.this, Android_SecondActivity.class);
    	     intent.putExtra("key1", "value1");
    	     Android_FirstActivity.this.startActivity(intent);
    	}
    }
}

step 5. 实现第二个activity

package com.example.michael;

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

public class Android_SecondActivity extends Activity {
	
	private TextView myTextView = null;
	
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        Intent intent = getIntent();
        String value = intent.getStringExtra("key1");
        myTextView = (TextView) findViewById(R.id.myView);
        myTextView.setText(value);
    }
}