Android学习札记一：Activity和Intent

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>