屏幕長亮

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;

	@Override
	protected 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 運轉，屏幕和鍵盤燈有多是關閉的。
		// SCREEN_DIM_WAKE_LOCK ：保持CPU 運轉，容許保持屏幕顯示但有多是灰的，容許關閉鍵盤燈
		// SCREEN_BRIGHT_WAKE_LOCK ：保持CPU 運轉，容許保持屏幕高亮顯示，容許關閉鍵盤燈
		// FULL_WAKE_LOCK ：保持CPU 運轉，保持屏幕高亮顯示，鍵盤燈也保持亮度
	}

	@Override
	protected void onPause() {
		super.onPause();
		lock.release();// 關閉長亮
	}

	@Override
	protected void onResume() {
		super.onResume();
		lock.acquire();// 打開長亮
	}
}

或者直接在onCreate()裏，不用權限getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

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