Android通信广播的注册与监听以及自定义广播

代码如下~

主函数代码

[code]package com.imooc.demo;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

public static final String MY_ACTION = "com.imooc.demo.afdsabfdaslj";
public static final String BROADCAST_CONTENT = "broadcast_content";
private ImoocBroadcastReceiver mBroadcastReceiver;
private EditText mInputEditText;
private Button mSendBroadcastButton;
private TextView mResultTextView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// 用包名做title
setTitle(getPackageName());

mInputEditText = findViewById(R.id.inputEditText);
mSendBroadcastButton = findViewById(R.id.sendBroadcastButton);
mResultTextView = findViewById(R.id.resultTextView);

// 新建广播接收器
mBroadcastReceiver = new ImoocBroadcastReceiver(mResultTextView);

// 注册广播接收器

// 为广播接收器添加Action
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.intent.action.PACKAGE_REMOVED");
intentFilter.addAction(MY_ACTION);
intentFilter.addAction()

// 注册广播接收器
registerReceiver(mBroadcastReceiver, intentFilter);

mSendBroadcastButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 新建广播
Intent intent = new Intent(MY_ACTION);
// 放入广播要携带的数据
intent.putExtra(BROADCAST_CONTENT, mInputEditText.getText().toString());
sendBroadcast(intent);
}
});

}

@Override
protected void onDestroy() {
super.onDestroy();
// 取消注册广播接收器，不然会导致内存泄露
if(mBroadcastReceiver != null){
unregisterReceiver(mBroadcastReceiver);
}
}
}

广播接收代码~ImoocBroadcastReceiver

[code]package com.imooc.demo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.text.TextUtils;
import android.util.Log;
import android.widget.TextView;

/**
* Created by renkangke .
*/
public class ImoocBroadcastReceiver extends BroadcastReceiver {

TextView mTextView;
public ImoocBroadcastReceiver() {
}

public ImoocBroadcastReceiver(TextView textView) {
mTextView = textView;
}

private static final String TAG = "ImoocBroadcastReceiver";
@Override
public void onReceive(Context context, Intent intent) {
// 接收广播
if(intent != null){
// 接收到的是什么广播
String action  = intent.getAction();
Log.d(TAG, "onReceive: " + action);

// 判断是什么广播（是不是我们自己发送的自定义广播）
if(TextUtils.equals(action, MainActivity.MY_ACTION)){
// 获取广播携带的内容， 可自定义的数据
String content = intent.getStringExtra(MainActivity.BROADCAST_CONTENT);
if(mTextView != null){
mTextView.setText("接收到的action是："+ action + "\n接收到的内容是：\n" + content);
}
}
}
}
}