android 开发之Activity切换

演示从一个Activity切换到另外的一个Activity.

 

第一个Activity

 

 

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 ActivitySecond extends Activity
{
    private Button btn2;
    private Button btnClose;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_activity);
        btn2 = (Button) findViewById(R.id.btn_back);
        btn2.setOnClickListener(new OnClickListener()
        {

            public void onClick(View v)
            {
                Intent intent = new Intent();
                intent.setClass(ActivitySecond.this, ActivityChange.class);
                startActivity(intent);
                //如果不关闭当前的会出现好多个页面
                ActivitySecond.this.finish();
            }

        });
        btnClose = (Button) findViewById(R.id.btn_close);
        btnClose.setOnClickListener(new OnClickListener()
        {

            public void onClick(View v)
            {
                finish();
            }

        });
    }

}

 

 

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 ActivityChange extends Activity {
    
    private Button btn;
    private Button btnClose;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(Button)findViewById(R.id.btnNextView);
        btn.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
                Intent itent=new Intent();
                itent.setClass(ActivityChange.this, ActivitySecond.class);
                startActivity(itent);
                ActivityChange.this.finish();
            }
        });
        
        btnClose=(Button)findViewById(R.id.btn_exit);
        btnClose.setOnClickListener(new OnClickListener()
        {
            public void onClick(View v)
            {
                finish();
            }
        });
    }
}

 

<?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:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button 
    android:id="@+id/btnNextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/show_next"
/>

<Button 
    android:id="@+id/btn_exit"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/btn_close"
/>
</LinearLayout>

 

 

 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="activity.change"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".ActivityChange"
                  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="ActivitySecond"
        />
    </application>

</manifest>