屏幕长亮

package com.example.timing;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.PowerManager;import android.os.PowerManager.WakeLock;public class TimingActivity extends Activity {PowerManager manager = null;WakeLock lock = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_timing);manager = (PowerManager) this.getSystemService(Context.POWER_SERVICE);lock = manager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "mylock");// PARTIAL_WAKE_LOCK :保持CPU 运转，屏幕和键盘灯有可能是关闭的。// SCREEN_DIM_WAKE_LOCK ：保持CPU 运转，允许保持屏幕显示但有可能是灰的，允许关闭键盘灯// SCREEN_BRIGHT_WAKE_LOCK ：保持CPU 运转，允许保持屏幕高亮显示，允许关闭键盘灯// FULL_WAKE_LOCK ：保持CPU 运转，保持屏幕高亮显示，键盘灯也保持亮度}@Overrideprotected void onPause() {super.onPause();lock.release();// 关闭长亮}@Overrideprotected void onResume() {super.onResume();lock.acquire();// 打开长亮}}

或者直接在onCreate()里，不用权限getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);