【重要组件间的数据传递1】如何将BroadcastReceiver中的数据传递给activity

题目描述

使用broadcastreceiver获得android手机的电池电量，并把电量显示到activity中。

技术分析

用接口传。定义一个接口 让 Activity实现这个接口，然后接受者调用接口里面的方法把要传递的参数传进去。

效果

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >

    <TextView
            android:id="@+id/text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World, MainActivity"
            />
</LinearLayout>

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.ht.dianliang"
          android:versionCode="1"
          android:versionName="1.0"
        >

    <uses-sdk android:minSdkVersion="7"/>
    <application
            android:label="@string/app_name"
            android:icon="@drawable/ic_launcher"
            >
        <activity
                android:name="MainActivity"
                android:label="@string/app_name"
                >
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <receiver android:name=".DianLiangBR"/>
    </application>
</manifest>

广播接收者子类书写

package com.ht.dianliang;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

/**
 * Created by annuo on 2015/5/16.
 */
public class DianLiangBR extends BroadcastReceiver {

    private BRInteraction brInteraction;
    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle bundle = intent.getExtras();
        //获取当前电量
        int current = bundle.getInt("level");
        //获取总电量（电池的电池容量）
        int total = bundle.getInt("scale");
        brInteraction.setText("当前电量：" + current + ",总电量：" + total);
    }

    public interface BRInteraction {
        public void setText(String content);
    }

    public void setBRInteractionListener(BRInteraction brInteraction) {
        this.brInteraction = brInteraction;
    }
}

activity书写

package com.ht.dianliang;

import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {

    private TextView textView;

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView = (TextView) findViewById(R.id.text);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        DianLiangBR dianLiangBR = new DianLiangBR();
        registerReceiver(dianLiangBR, intentFilter);
        dianLiangBR.setBRInteractionListener(new DianLiangBR.BRInteraction() {
            @Override
            public void setText(String content) {
                if (content != null) {
                    textView.setText(content);
                }
            }
        });
    }
}