package android.study.com;
import android.app.Activity;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
public class BatteryInfo extends Activity {
/* 变量声明 */
private int intLevel;
private int intScale;
private Button mButton01;
/* 创建BroadcastReceiver */
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
/*
* 如果捕捉到的action是ACTION_BATTERY_CHANGED，就运行onBatteryInfoReceiver()
*/
if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
intLevel = intent.getIntExtra("level", 0);
intScale = intent.getIntExtra("scale", 100);
Log.i("", "intLevel = " + intLevel);
Log.i("", "intScale = " + intScale);
onBatteryInfoReceiver(intLevel, intScale);
}
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mButton01 = (Button) findViewById(R.id.myButton1);
mButton01.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
// 注册一个系统 BroadcastReceiver，作为访问电池计量之用
// 这个不能直接在AndroidManifest.xml中注册
registerReceiver(mBatInfoReceiver, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED));
}
});
}
/* 捕捉到ACTION_BATTERY_CHANGED时要运行的method */
public void onBatteryInfoReceiver(int intLevel, int intScale) {
/* create 跳出的对话窗口 */
final Dialog d = new Dialog(BatteryInfo.this);
d.setTitle(R.string.str_dialog_title);
d.setContentView(R.layout.mydialog);
/* 创建一个背景模糊的Window，且将对话窗口放在前景 */
Window window = d.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
/* 将取得的电池计量显示于Dialog中 */
TextView mTextView02 = (TextView) d.findViewById(R.id.myTextView2);
mTextView02.setText(getResources().getText(R.string.str_dialog_body)
+ String.valueOf(intLevel * 100 / intScale) + "%");
/* 设置返回主画面的按钮 */
Button mButton02 = (Button) d.findViewById(R.id.myButton2);
mButton02.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
/* 反注册Receiver，并关闭对话窗口 */
unregisterReceiver(mBatInfoReceiver);
d.dismiss();
}
});
d.show();
}
}
代码里还用到了自定义的Dialog布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/white"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/myTextView2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="@drawable/blue"
android:textSize="16sp"
android:gravity="center"
android:padding="10px"
/>
<Button
android:id="@+id/myButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/str_button2"
/>
</LinearLayout>
