Android学习笔记一：Activity和Intent

Activity01.java

package org.jzkangta.activity01;

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 Activity01 extends Activity {
	
	private  Button button1 = null;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(new MyButtonListener());  //点击之后就去执行监听器里的方法
        
    }
    
    /**
     * onClick事件的监听器
     * @author Administrator
     *
     */
    private class MyButtonListener implements OnClickListener{

		public void onClick(View v) {
			// TODO Auto-generated method stub
			Intent intent = new Intent();  //类似于web里的request
			intent.setClass(Activity01.this, Activity02.class); //从哪个Activity传到哪个Activity
			intent.putExtra("key", "哈哈，大家好");  //put一些值
			Activity01.this.startActivity(intent);  //启动下一个Activity
		}
    	
    }
}

Activity02.java

package org.jzkangta.activity01;

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

public class Activity02 extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity02);//得到本Activity的布局文件
		
		Intent intent = getIntent();  //得到上一个传过来的Intent
		String value = intent.getStringExtra("key");  //得到值
		
		TextView tv = (TextView)findViewById(R.id.textview1);
		tv.setText(value);
	}

	
}

main.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"
    >
<Button  
    android:id="@+id/button1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="点我一下"
    />
</LinearLayout>

activity02.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/textview1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
   
    />
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="org.jzkangta.activity01"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Activity01"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- 注册另一个activity  -->
         <activity android:name=".Activity02"
                  android:label="@string/app_name">
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="7" />

</manifest>