MainActivity 通过广播接收 IntentService传过来的数据

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最新推荐文章于 2024-11-25 13:56:51 发布

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本文链接：https://blog.youkuaiyun.com/u011164565/article/details/53571733

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该博客展示了如何在Android应用中，通过IntentService处理后台任务，如模拟图片上传，并利用BroadcastReceiver在MainActivity中接收并显示服务返回的数据。

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package com.example.administrator.bis;


import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyIntentService extends IntentService
{
    private static final String ACTION_UPLOAD_IMG = "UPLOAD_IMAGE";
    public static final String EXTRA_IMG_PATH = "IMG_PATH";
/*
这里启动服务 模拟图片上传
 */
    public static void startUploadImg(Context context, String path)
    {
        Intent intent = new Intent(context, MyIntentService.class);
        intent.setAction(ACTION_UPLOAD_IMG);
        intent.putExtra(EXTRA_IMG_PATH, path);
        context.startService(intent);
    }


    public MyIntentService()
    {
        super("UploadImgService");
    }
/*
处理数据
 */
    @Override
    protected void onHandleIntent(Intent intent)
    {
        if (intent != null)
        {
            final String action = intent.getAction();
            if (ACTION_UPLOAD_IMG.equals(action))
            {
                final String path = intent.getStringExtra(EXTRA_IMG_PATH)+MyIntentService.class.getName();
                handleUploadImg(path);
            }
        }
    }

    private void handleUploadImg(String path)
    {

            Intent intent = new Intent(MainActivity.UPLOAD_RESULT);
            intent.putExtra(EXTRA_IMG_PATH, path);
            sendBroadcast(intent);

    }
    @Override
    public void onCreate()
    {
        super.onCreate();
        Log.e("TAG","onCreate");
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();
        Log.e("TAG","onDestroy");
    }

}

package com.example.administrator.bis;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity{

    public static final String UPLOAD_RESULT = "UPLOAD_RESULT";

    private LinearLayout mLyTaskContainer;

    private BroadcastReceiver uploadImgReceiver = new BroadcastReceiver()
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            if (intent.getAction() == UPLOAD_RESULT)
            {
                String path = intent.getStringExtra(MyIntentService.EXTRA_IMG_PATH);

                handleResult(path);

            }

        }
    };


private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
tv= (TextView) findViewById(R.id.tv);
        mLyTaskContainer = (LinearLayout) findViewById(R.id.id_ll_taskcontainer);

        registerReceiver();
    }

    private void registerReceiver()
    {
        IntentFilter filter = new IntentFilter();
        filter.addAction(UPLOAD_RESULT);
        registerReceiver(uploadImgReceiver, filter);
    }

    int i = 0;

    public void addTask(View view)
    {
        //模拟路径
        String path = "/sdcard/imgs/" + (++i) + ".png";
        MyIntentService.startUploadImg(this, path);
    }


    @Override
    protected void onDestroy()
    {
        super.onDestroy();
        unregisterReceiver(uploadImgReceiver);
    }
    private void handleResult(String path)
    {
        tv.setText(path);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.bis.MainActivity">

    <LinearLayout android:id="@+id/id_ll_taskcontainer"
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
<TextView
    android:id="@+id/tv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

        <Button android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:onClick="addTask" android:text="add Task"/>
    </LinearLayout>
</RelativeLayout>