Android电池相关信息的获取

1.定义广播接收，显示电池信息--BatteryInfoBroadcastReceiver

    package org.lxh.demo;                import android.app.AlertDialog;        import android.app.Dialog;        import android.content.BroadcastReceiver;        import android.content.Context;        import android.content.DialogInterface;        import android.content.Intent;                public class BatteryInfoBroadcastReceiver extends BroadcastReceiver {                    @Override            public void onReceive(Context context, Intent intent) {                if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {                    int level = intent.getIntExtra("level", 0);                    int scale = intent.getIntExtra("scale", 0);                    int voltage = intent.getIntExtra("voltage", 0);                    int temperature = intent.getIntExtra("temperature", 0);                    String technology = intent.getStringExtra("technology");                    Dialog dialog = new AlertDialog.Builder(context)                            .setTitle("电池电量")                            .setMessage(                                    "电池电量为：" + String.valueOf(level * 100 / scale)                                            + "%\n" + "电池电压为："                                            + String.valueOf((float)voltage / 1000) + "v"                                            + "\n电池类型为：" + technology + "\n" + "电池温度为："                                            + String.valueOf((float)temperature / 10) + "°C")                            .setNegativeButton("关闭",                                    new DialogInterface.OnClickListener() {                                                public void onClick(DialogInterface arg0,                                                int arg1) {                                                }                                    }).create();                    dialog.show();                }                    }                }  

    <?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:id="@+id/mybtn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="获取电池电量" />                </LinearLayout>  

    package org.lxh.demo;                import android.app.Activity;        import android.app.AlertDialog;        import android.app.Dialog;        import android.content.DialogInterface;        import android.content.Intent;        import android.content.IntentFilter;        import android.os.Bundle;        import android.view.View;        import android.view.View.OnClickListener;        import android.view.View.OnFocusChangeListener;        import android.widget.Button;        import android.widget.EditText;        import android.widget.TextView;                public class Hello extends Activity {            private Button mybtn = null;                    public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState); // 生命周期方法                super.setContentView(R.layout.main); // 设置要使用的布局管理器                this.mybtn = (Button) super.findViewById(R.id.mybtn);                this.mybtn.setOnClickListener(new OnClickListenerImpl());                    }                    private class OnClickListenerImpl implements OnClickListener {                        public void onClick(View v) {                    BatteryInfoBroadcastReceiver receiver = null;                    receiver = new BatteryInfoBroadcastReceiver();                    IntentFilter filter = new IntentFilter(                            Intent.ACTION_BATTERY_CHANGED);                    Hello.this.registerReceiver(receiver, filter);                        }                    }        }