Android(安卓)设置亮度

设置当前Activity中的亮度，退出Activity后恢复系统默认亮度。

未测试系统改变亮度后Activity亮度是否改变。

package com.ltc.screen;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.WindowManager;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class Actmain extends Activity {private TextView textView;private Button button;float f = 1.0f;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                textView = (TextView)findViewById(R.id.textview);        button = (Button)findViewById(R.id.btn);        button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubf -= 0.1f;//f 不能 为0 ，为0就锁屏了。if(f < 0.0001f){f = 1.0f;}setBrightness(f);}});    }            private void setBrightness(float f){    WindowManager.LayoutParams lp = getWindow().getAttributes();lp.screenBrightness = f;   getWindow().setAttributes(lp);    }}

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