Activity1.2

Starting an Activity

You can start another activity by calling startActivity()

The intent specifies either the exact activity you want to start or describes the type of action you want to perform

 

An intent can also carry small amounts of data to be used by the activity that is started.

 

package com.cmge;

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

/**
 * @desc	一个简单的Activity
 * @author	ljt
 * @time	2014年8月24日 下午10:42:19
 */
public class MainActivity extends Activity {

	private Button button;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) this.findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this,NextActivity.class);
				startActivity(intent);
			}
		});
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

 

package com.cmge;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class NextActivity extends Activity {
	
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.next);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
	
}

 

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

	<Button 
	    android:id="@+id/button1"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="点击"
	    />
    
</RelativeLayout>

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

 

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.cmge.MainActivity"
            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="com.cmge.NextActivity">
        </activity>
    </application>

 

Intent intent = new Intent(MainActivity.this,NextActivity.class);
				intent.putExtra("name", "cmge");
				intent.putExtra("age", 111);
				
				Bundle bundle = new Bundle();
				bundle.putString("name1", "cmge");
				bundle.putInt("age1", 111);
				
				intent.putExtra("list",bundle);
				startActivity(intent);

 

Intent intent = getIntent();
        System.out.println("=="+intent.getStringExtra("name"));
        System.out.println("=="+intent.getIntExtra("age", 0));
        
        Bundle bundle = intent.getBundleExtra("list");
        System.out.println("=="+bundle.get("name1"));
        System.out.println("=="+bundle.get("age1"));

 

08-24 23:35:28.365: I/System.out(5382): ==cmge
08-24 23:35:28.365: I/System.out(5382): ==111
08-24 23:35:28.365: I/System.out(5382): ==cmge
08-24 23:35:28.365: I/System.out(5382): ==111

 

 Intent intent = getIntent();
//      System.out.println("=="+intent.getStringExtra("name"));
//      System.out.println("=="+intent.getIntExtra("age", 0));
        
        Log.i(TAG, "=="+intent.getStringExtra("name"));
        Log.i(TAG, "=="+intent.getIntExtra("age"));
        
        Bundle bundle = intent.getBundleExtra("list");
//      System.out.println("=="+bundle.get("name1"));
//      System.out.println("=="+bundle.get("age1"));
        Log.i(TAG, "=="+bundle.get("name1"));
        Log.i(TAG, "=="+bundle.get("age1"));

 

08-24 23:39:02.400: I/NextActivity(5567): ==cmge
08-24 23:39:02.400: I/NextActivity(5567): ==null
08-24 23:39:02.400: I/NextActivity(5567): ==cmge
08-24 23:39:02.400: I/NextActivity(5567): ==111