1. Define broadcast reception, display battery information -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();
}
}
}
2. Define the layout manager -main.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:id="@+id/mybtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="获取电池电量" />
</LinearLayout>
3. Define Activity program:
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);
}
}
}
On the actual phone operating results as follows:
