android之檢測手機電池

效果圖：

activity代碼：

package cn.com.chenzheng_java; 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.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.view.WindowManager; import android.view.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; /*** * @description 查看手機電池電量，這裏要注意監聽Intent.ACTION_BATTERY_CHANGED的廣播接收者，只能 * 在程序中顯示的註冊，不能再androiManifest.xml中進行靜態的註冊 * @author chenzheng_java * @since 2011/03/16 * */ public class BatteryActivity extends Activity implements OnClickListener{ // 當系統處於充電狀態或者電量發生改變時會廣播該action private static final String ACTION_NAME = Intent.ACTION_BATTERY_CHANGED; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.battery); Button button = (Button) findViewById(R.id.button1); // 注意哦，我們這裏的activity實現了View.OnClickListener接口 button.setOnClickListener(this); } // 聲明廣播接收者 BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String actionName = intent.getAction(); if(actionName.equals(ACTION_NAME)){ int level = intent.getIntExtra("level", 0); int scale = intent.getIntExtra("scale", 100); // Toast.makeText(BatteryActivity.this, "level="+level+" scale="+scale, Toast.LENGTH_LONG).show(); final Dialog dialog = new Dialog(BatteryActivity.this); dialog.setTitle("電量顯示"); // 加載xml佈局文件爲View對象 LayoutInflater flater = LayoutInflater.from(BatteryActivity.this); View view = flater.inflate(R.layout.battery2, null); dialog.setContentView(view,new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); /** * 獲取該dialog顯示的父窗口，然後設置當dialog顯示時，窗口內的其他部分設置爲模糊 * WindowManager.LayoutParams.FLAG_BLUR_BEHIND告訴我們，無論什麼對象顯示於前段， * 都會顯示在window的最上層 */ Window window = dialog.getWindow(); window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, WindowManager.LayoutParams.FLAG_BLUR_BEHIND); /** * 這裏注意findViewById()方法，默認的會去加載main.xml中的組件。如果你想加載x.xml中的id爲 * a的組件，那麼應該在前面加上setContentView這個佈局文件的對象，如這裏的dialog */ TextView textView = (TextView)dialog.findViewById(R.id.textView_message); textView.setText("目前的手機電量爲"+level*100/scale+"%"); Button button2 = (Button) dialog.findViewById(R.id.button_back); button2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { dialog.dismiss(); // 註銷廣播接收者 unregisterReceiver(broadcastReceiver); } }); dialog.show(); } } }; @Override public void onClick(View v) { IntentFilter filter = new IntentFilter(ACTION_NAME); registerReceiver(broadcastReceiver, filter); } }

battery2.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <TextView android:text="TextView" android:id="@+id/textView_message" android:textSize="10sp" android:gravity="center" android:padding="10px" android:layout_width="fill_parent" android:layout_height="wrap_content"></TextView> <Button android:id="@+id/button_back" android:layout_width="wrap_content" android:text="返回" android:layout_height="wrap_content"></Button> </LinearLayout>

battery.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <Button android:text="顯示電量" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout>