android（静态广播和动态广播） _Android

盛年不重来，一日难再晨，及时当勉励，岁月不待人。这篇文章主要讲述android：静态广播和动态广播相关的知识，希望能为你提供帮助。
静态广播主要是在manifest.xml里面
加入 < receiver android:name=".MyBroadcastReceiver> 组件。并给出接收类。
【android（静态广播和动态广播）】

< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.example.mybroadcast"> < application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> < activity android:name=".MainActivity"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < !-- 静态注册广播接收器 --> < receiver android:name=".MyBroadcastReceiver"> < !-- 接收哪些广播 --> < intent-filter> < !-- 开机广播 --> < action android:name="android.intent.action.BOOT_COMPLETED"/> < !-- 电量低广播 --> < action android:name="android.intent.action.BATTERY_LOW"/> < /intent-filter> < /receiver> < /application> < /manifest>

接收类

package com.example.mybroadcast; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.text.TextUtils; import android.util.Log; import android.widget.TextView; public class MyBroadcastReceiver extends BroadcastReceiver { final String TAG ="ygy"; TextView mTextView; public MyBroadcastReceiver(TextView textView) { mTextView = textView; } public MyBroadcastReceiver() {} @Override public void onReceive(Context context, Intent intent) { if(intent != null){ String action = intent.getAction(); Log.e(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); Log.e(TAG, "接收到的action是："+ action + "\\n接收到的内容是：\\n" + content ); if(mTextView != null){ mTextView.setText("接收到的action是："+ action + "\\n接收到的内容是：\\n" + content); } } } } }

动态广播，在activity里面注册了广播，然后在广播接收类里面接收。

package com.example.mybroadcast; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; 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.ygy.demo.good"; public static final String BROADCAST_CONTENT = "broadcast_content"; private MyBroadcastReceiver 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 MyBroadcastReceiver(mResultTextView); // mBroadcastReceiver = new MyBroadcastReceiver(); // 注册广播接收器// 为广播接收器添加Action IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(MY_ACTION); intentFilter.addAction("android.intent.action.SCREEN_OFF"); intentFilter.addAction("android.intent.action.SCREEN_ON"); //加上addDataScheme("package")就收不到其他消息了; 不加，收不到 android.intent.action.PACKAGE_REMOVED // intentFilter.addAction("android.intent.action.PACKAGE_REMOVED"); // intentFilter.addAction("android.intent.action.PACKAGE_INSTALL"); // intentFilter.addDataScheme("package"); // 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); } } }

按钮实现的是自定义广播发送。 app内部的自己发，自己接收。