[问题]问个屏幕亮度的问题

package com.zzci.light; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.res.Resources; import android.graphics.drawable.Drawable; import android.hardware.SensorManager; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.Window; import android.view.WindowManager; import android.widget.LinearLayout; import android.widget.Toast; public class ColorLightActivity extends Activity { /** Called when the activity is first created. */ private LinearLayout mylayout; private Resources myColor; private int li; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); HideStatusBase(); setContentView(R.layout.main); //改背layout背景颜色 mylayout=(LinearLayout)findViewById(R.id.mylayout); SetColor(R.color.white); //结束改变背景颜色 //改变屏幕亮度 li=0; SetBright(1.0f); } /** * 屏幕点击事件显示菜单 */ @Override public boolean onTouchEvent(MotionEvent event){ //Toast.makeText(ColorLightActivity.this, "测试", Toast.LENGTH_SHORT).show(); openOptionsMenu(); return false; } /** * 关联菜单 */ @Override public boolean onCreateOptionsMenu(Menu menu){ super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.menu, menu); //menu.findItem(R.id.about).setEnabled(false); return true; } /** * 捕捉菜单事件 */ @Override public boolean onOptionsItemSelected(MenuItem item){ switch(item.getItemId()) { case R.id.about: //Toast.makeText(ColorLightActivity.this, "关于菜单", Toast.LENGTH_LONG).show(); about(); return true; case R.id.setcolor: //Toast.makeText(ColorLightActivity.this, R.string.setcolor, Toast.LENGTH_SHORT).show(); selectColor(); return true; case R.id.setbright: selectBright(); //Toast.makeText(ColorLightActivity.this, "关于菜单", Toast.LENGTH_LONG).show(); return true; case R.id.seteffer: //Toast.makeText(ColorLightActivity.this, "关于菜单", Toast.LENGTH_LONG).show(); finish(); return true; } return false; } /** * 选择颜色 */ public void selectColor() { final String[] items = {"白色", "红色", "黑色","黄色","粉色"}; new AlertDialog.Builder(this) .setTitle("选择颜色") //此处 this 代表当前Activity .setItems(items, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int item) { Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show(); //将选中的文本内容按照土司提示 方式显示出来, 此处的getApplicationContext() 得到的也是当前的Activity对象，可用当前Activity对象的名字.this代替（Activity.this） switch (item) { case 0: SetColor(R.color.white); break; case 1: SetColor(R.color.red); break; case 2: SetColor(R.color.black); break; case 3: SetColor(R.color.yellow); break; case 4: SetColor(R.color.fs); break; default: SetColor(R.color.white); break; } } }).show();//显示对话框 } /** * 选择亮度 */ public void selectBright() { final String[] items = {"100%", "75%", "50%","25%","10%"}; new AlertDialog.Builder(this) .setTitle("选择亮度") .setSingleChoiceItems(items, li, new DialogInterface.OnClickListener() { //此处数字为选项的下标，从0开始， 表示默认哪项被选中 public void onClick(DialogInterface dialog, int item) { Toast.makeText(getApplicationContext(), items[item],Toast.LENGTH_SHORT).show(); li=item; switch (item) { case 0: SetBright(1.0F); break; case 1: SetBright(0.75F); break; case 2: SetBright(0.5F); break; case 3: SetBright(0.25F); break; case 4: SetBright(0.1F); break; default: SetBright(1.0F); break; } dialog.cancel(); } }).show();//显示对话框 } /** * 显示关于我们 */ public void about(){ new AlertDialog.Builder(ColorLightActivity.this).setTitle("关于我们") .setMessage("欢迎您使用阳光手电筒1.0版\n我们的网站是:\nhttp://www.zzci.com\n作者：张水华\n邮件：\nryangecko@gmail.com").setIcon(R.drawable.icon) .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // finish(); } }).setNegativeButton("返回", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }).show(); } /** * 全屏设置 */ private void HideStatusBase() { requestWindowFeature(Window.FEATURE_NO_TITLE); int flag=WindowManager.LayoutParams.FLAG_FULLSCREEN; Window myWindow=this.getWindow(); myWindow.setFlags(flag,flag); } /** * 设置屏幕颜色 * @param color_M */ private void SetColor(int color_1) { myColor = getBaseContext().getResources(); Drawable color_M = myColor.getDrawable(color_1); mylayout.setBackgroundDrawable(color_M); //mylayout.setBackgroundColor(Color.argb(255, 255, 255, 255)); } /** * 设置屏幕亮度 * @param light */ private void SetBright(float light) { WindowManager.LayoutParams lp=getWindow().getAttributes(); lp.screenBrightness=light; getWindow().setAttributes(lp); } }

复制了你的代码，没发现这个错误 你再定位下

整个项目clean一下重新编译 【 在 susanlt (青桐半浅) 的大作中提到: 】 : 小程序，想说明明亮度调节的话就 : private void SetBright(float light) : { : ...................