我正在尝试使用以下代码扩展活动来广播Toast消息.但是广播没有被另一个活动收到,烤面包没有显示.有人能解决我的错误吗？主要活动是SendBroadcast.
java
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class SendBroadcast extends Activity {
public static String BROADCAST_ACTION =
"com.unitedcoders.android.broadcasttest.SHOWTOAST";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void sendBroadcast(View v) {
Intent broadcast = new Intent();
broadcast.setAction(BROADCAST_ACTION);
sendBroadcast(broadcast);
}
}
Toast Display Activity是ToastDisplay.java
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.Toast;
public class ToastDisplay extends Activity {
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context,Intent intent) {
Toast.makeText(getApplicationContext(),"received",Toast.LENGTH_SHORT).show();
}
};
@Override
protected void onResume() {
IntentFilter filter = new IntentFilter();
filter.addAction(SendBroadcast.BROADCAST_ACTION);
registerReceiver(receiver,filter);
super.onResume();
}
@Override
protected void onPause() {
unregisterReceiver(receiver);
super.onPause();
}
}
和manifest.xml如下
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.broad"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="3" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".SendBroadcast"
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=".ToastReceiver" >
<intent-filter>
<action android:name="com.unitedcoders.android.broadcasttest.SHOWTOAST" />
</intent-filter>
</receiver>
</application>
</manifest>
解决方法
可以有两种类型的broacast：静态和动态.静态是清单文件中声明的那些.动态可以在运行时声明.您将这两种类型的广播组合在一个广播中.
要声明一个简单的动态广播,您可以使用以下代码(基于您的代码).当显示活动时,它将只显示Toast消息.
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class BroadcastTestActivity extends Activity {
public static String BROADCAST_ACTION =
"com.unitedcoders.android.broadcasttest.SHOWTOAST";
BroadcastReceiver br = new BroadcastReceiver() {
@Override
public void onReceive(Context context,Intent intent) {
Log.w("Check","Inside On Receiver");
Toast.makeText(getApplicationContext(),Toast.LENGTH_SHORT).show();
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
IntentFilter filter = new IntentFilter();
filter.addAction(BROADCAST_ACTION);
filter.addCategory(Intent.CATEGORY_DEFAULT);
registerReceiver(br,filter);
}
@Override
protected void onResume() {
super.onResume();
sendBroadcast();
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(br);
}
public void sendBroadcast() {
Intent broadcast = new Intent();
broadcast.setAction(BROADCAST_ACTION);
broadcast.addCategory(Intent.CATEGORY_DEFAULT);
sendBroadcast(broadcast);
}
}
