android 之button 屏幕翻转

分类：android

一、使用资源文件，对按钮不同状态（按下，获得焦点、弹起）做出改变

二、调用api，实现手机屏幕竖屏和横屏的转换

直接见代码

布局文件main.xml：

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

</LinearLayout>

注意Button > background 中引用资源文件 button.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="@drawable/android_pressed" /> 

<item android:state_focused="true"
android:drawable="@drawable/android_focused" /> 

<item android:state_selected="true"
android:drawable="@drawable/android_focused"
></item>
<item android:drawable="@drawable/android_normal" /> 
</selector>

Activity实现类：

package com.time.android.button;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class ButtonTestActivity extends Activity {

private Button btn = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(ButtonTestActivity.this, "click", Toast.LENGTH_LONG).show();
/*屏幕翻转*/
if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}else{
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
}
});
}
}

另外获得屏幕尺寸方法：

final DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

String res = metrics.widthPixels +":" +metrics.heightPixels;

android 之button 屏幕翻转

android 之button 屏幕翻转

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