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import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;
import android.os.PowerManager;
import android.os.SystemClock;
import android.util.Log;
//注意，PowerManager只有系统应用才能操作，普通应用不能操作，所以下面代码仅供参考
public class PowerUtil {
private final static String TAG = "PowerUtil";
private static int getValue(Context ctx, String methodName, int defValue) {
int value = defValue;
PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
try {
Class<?> pmClass = Class.forName(pm.getClass().getName());
Field field = pmClass.getDeclaredField("mService");
field.setAccessible(true);
Object iPM = field.get(pm);
Class<?> iPMClass = Class.forName(iPM.getClass().getName());
Method method = iPMClass.getDeclaredMethod(methodName);
method.setAccessible(true);
value = (Integer) method.invoke(iPM);
} catch (Exception e) {
e.printStackTrace();
}
Log.d(TAG, "methodName="+methodName+", value="+value);
return value;
}
public static int getMinLight(Context ctx) {
return getValue(ctx, "getMinimumScreenBrightnessSetting", 0);
}
public static int getMaxLight(Context ctx) {
return getValue(ctx, "getMaximumScreenBrightnessSetting", 255);
}
public static int getDefLight(Context ctx) {
return getValue(ctx, "getDefaultScreenBrightnessSetting", 100);
}
//设置屏幕亮度。light取值0-255
public static void setLight(Context ctx, int light) {
PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
try {
Class<?> pmClass = Class.forName(pm.getClass().getName());
// 得到PowerManager类中的成员mService（mService为PowerManagerService类型）
Field field = pmClass.getDeclaredField("mService");
field.setAccessible(true);
// 实例化mService
Object iPM = field.get(pm);
// 得到PowerManagerService对应的Class对象
Class<?> iPMClass = Class.forName(iPM.getClass().getName());
/*
* 得到PowerManagerService的函数setBacklightBrightness对应的Method对象，
* PowerManager的函数setBacklightBrightness实现在PowerManagerService中
*/
Method method = iPMClass.getDeclaredMethod("setBacklightBrightness", int.class);
method.setAccessible(true);
// 调用实现PowerManagerService的setBacklightBrightness
method.invoke(iPM, light);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void resetLight(Context ctx, int light) {
try {
Object power;
Class <?> ServiceManager = Class.forName("android.os.ServiceManager");
Class <?> Stub = Class.forName("android.os.IPowerManager$Stub");
Method getService = ServiceManager.getMethod("getService", new Class[] {String.class});
//Method asInterface = GetStub.getMethod("asInterface", new Class[] {IBinder.class});//of this class?
Method asInterface = Stub.getMethod("asInterface", new Class[] {IBinder.class}); //of this class?
IBinder iBinder = (IBinder) getService.invoke(null, new Object[] {Context.POWER_SERVICE});//
power = asInterface.invoke(null,iBinder);//or call constructor Stub?//
Method setBacklightBrightness = power.getClass().getMethod("setBacklightBrightness", new Class[]{int.class});
setBacklightBrightness.invoke(power, new Object[]{light});
} catch (Exception e) {
e.printStackTrace();
}
}
//锁屏
public static void lockScreen(Context ctx) {
PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
pm.goToSleep(SystemClock.uptimeMillis());
}
//解锁
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
public static void unLockScreen(Context ctx) {
PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
pm.wakeUp(SystemClock.uptimeMillis());
}
//重启
public static void reboot(Context ctx) {
PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE);
pm.reboot(null);
}
//关机
public static void shutDown(Context ctx) {
Intent intent = new Intent("android.intent.action.ACTION_REQUEST_SHUTDOWN");
intent.putExtra("android.intent.extra.KEY_CONFIRM", false);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// 弹出系统内置的对话框，选择确定关机或取消关机
ctx.startActivity(intent);
}
}
import com.example.exmbattery.util.DateUtils;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.widget.TextView;
public class BatteryActivity extends Activity {
private TextView tv_battery_change;
private static TextView tv_power_status;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_battery);
tv_battery_change = (TextView) findViewById(R.id.tv_battery_change);
tv_power_status = (TextView) findViewById(R.id.tv_power_status);
}
@Override
protected void onStart() {
super.onStart();
batteryChangeReceiver = new BatteryChangeReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryChangeReceiver, filter);
}
@Override
protected void onStop() {
super.onStop();
unregisterReceiver(batteryChangeReceiver);
}
private BatteryChangeReceiver batteryChangeReceiver;
private class BatteryChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent != null) {
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, 0);
int healthy = intent.getIntExtra(BatteryManager.EXTRA_HEALTH, 0);
int voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, 0);
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 3);
String technology = intent.getStringExtra(BatteryManager.EXTRA_TECHNOLOGY);
int temperature = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, 0);
boolean present = intent.getBooleanExtra(BatteryManager.EXTRA_PRESENT, false);
String desc = String.format("%s : 收到广播：%s",
DateUtils.getNowDateTime(), intent.getAction());
desc = String.format("%s\n电量刻度=%d", desc, scale);
desc = String.format("%s\n当前电量=%d", desc, level);
desc = String.format("%s\n当前状态=%s", desc, mStatus[status]);
desc = String.format("%s\n健康程度=%s", desc, mHealthy[healthy]);
desc = String.format("%s\n当前电压=%d", desc, voltage);
desc = String.format("%s\n当前电源=%s", desc, mPlugged[plugged]);
desc = String.format("%s\n当前技术=%s", desc, technology);
desc = String.format("%s\n当前温度=%d", desc, temperature/10);
desc = String.format("%s\n是否提供电池=%s", desc, present?"是":"否");
tv_battery_change.setText(desc);
}
}
}
private static String[] mStatus = {"不存在", "未知", "正在充电", "正在断电", "不在充电", "充满"};
private static String[] mHealthy = {"不存在", "未知", "良好", "过热", "坏了", "短路", "未知错误", "冷却"};
private static String[] mPlugged = {"电池", "充电器", "USB", "不存在", "无线"};
private static String mChange = "";
public static class PowerChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent != null) {
mChange = String.format("%s\n%s : 收到广播：%s",
mChange, DateUtils.getNowDateTime(), intent.getAction());
tv_power_status.setText(mChange);
}
}
}
}
import com.example.exmbattery.util.DateUtils;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class LockScreenReceiver extends BroadcastReceiver {
private static final String TAG = "LockScreenReceiver";
@Override
public void onReceive(Context context, Intent intent) {
if (intent != null) {
String mChange = "";
mChange = String.format("%s\n%s : 收到广播：%s", mChange,
DateUtils.getNowDateTime(), intent.getAction());
if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
mChange = String.format("%s\n这是屏幕点亮事件", mChange);
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
mChange = String.format("%s\n这是屏幕关闭事件", mChange);
} else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
mChange = String.format("%s\n这是用户解锁事件", mChange);
}
Log.d(TAG, mChange);
MainApplication.getInstance().setChangeDesc(mChange);
}
}
}import android.app.Application;
import android.content.Intent;
import android.content.IntentFilter;
public class MainApplication extends Application {
private static MainApplication mApp;
private LockScreenReceiver mReceiver;
private String mChange = "";
public static MainApplication getInstance() {
return mApp;
}
public String getChangeDesc() {
return mApp.mChange;
}
public void setChangeDesc(String change) {
mApp.mChange = mApp.mChange + change;
}
@Override
public void onCreate() {
super.onCreate();
mApp = this;
mReceiver = new LockScreenReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
registerReceiver(mReceiver, filter);
}
@Override
public void onTerminate() {
unregisterReceiver(mReceiver);
super.onTerminate();
}
}import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class ScreenActivity extends Activity {
private static TextView tv_screen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_screen);
tv_screen = (TextView) findViewById(R.id.tv_screen);
}
@Override
protected void onStart() {
super.onStart();
tv_screen.setText(MainApplication.getInstance().getChangeDesc());
}
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原文地址：http://blog.csdn.net/aqi00/article/details/52095301
