是否LocalBroadcastManager只在一个活动工作？ [英] Does LocalBroadcastManager only work in the one Activity?
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问题描述
我已阅读文档如何使用LocalBroadcastManager？。
它运作良好，在SMSMain.java，我可以找到日志信息得到的消息：这是一个当我点击SMSMain.java btnToMore按钮。
但我不能找到日志信息，如果我点击StepName.java btnNext按钮。
顺便说一句，我通过单击SMSMain.java的btnAddRule按钮打开StepName.java。
SMSMain.java
包UI;
进口info.dodata.smsforward.R;
进口android.app.ListActivity;
进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;
进口android.content.IntentFilter;
进口android.os.Bundle;
进口android.support.v4.content.LocalBroadcastManager;
进口android.util.Log;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口bll.PublicPar;公共类SMSMain扩展ListActivity {
私人广播接收器mMessageReceiver =新的广播接收器（）{
@覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
字符串消息= intent.getStringExtra（信息）;
Log.d（接收器，得到消息：+消息）;
}
};
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.sms_main）; 按钮btnAddRule =（按钮）findViewById（R.id.btnAddRule）;
btnAddRule.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
意向意图=新意图（）。setClass（getApplicationContext（）
ui.StepName.class）;
startActivityForResult（意向，20）;
}
}）; 按钮btnToMore =（按钮）findViewById（R.id.btnToMore）;
btnToMore.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
意向意图=新意图（PublicPar.LocalBroadcastForRule）;
intent.putExtra（信息，这是一个！）;
LocalBroadcastManager.getInstance（getApplicationContext（））sendBroadcast（意向）。 }
}）; findViewById（R.id.btnClose）.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
完（）;
}
}）; } @覆盖
保护无效onResume（）{
// TODO自动生成方法存根
super.onResume（）;
LocalBroadcastManager.getInstance（本）.registerReceiver（mMessageReceiver，
新的IntentFilter（PublicPar.LocalBroadcastForRule））;
}
@覆盖
保护无效的onPause（）{
// TODO自动生成方法存根
super.onPause（）;
LocalBroadcastManager.getInstance（本）.unregisterReceiver（mMessageReceiver）;
}
}
StepName.java
包UI;
进口info.dodata.smsforward.R;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.support.v4.content.LocalBroadcastManager;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
进口bll.PublicPar;公共类StepName延伸活动{
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.sms_step_name）;
按钮btnNext =（按钮）findViewById（R.id.btnNext）;
btnNext.setOnClickListener（新OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{ 意向意图=新意图（PublicPar.LocalBroadcastForRule）;
intent.putExtra（信息，这为B！）;
LocalBroadcastManager.getInstance（getApplicationContext（））sendBroadcast（意向）。 完（）;
}
}）; }
}
解决方案
如果你想在各种不同的活动来接收 LocalBroadcast ，你必须注册接收器所有那些接受活动。在发件人活动发送/广播通知和手表通知有登记广播接收器，用于接收通知的接收器的工作。
I have read the doc how to use LocalBroadcastManager?.
It works well in the SMSMain.java, and I can find the log info "Got message: This is A!" when I click btnToMore button in SMSMain.java .
But I can't find the log info if I click btnNext button in StepName.java.
BTW, I open StepName.java by clicking the btnAddRule button in SMSMain.java .
SMSMain.java
package ui;
import info.dodata.smsforward.R;
import android.app.ListActivity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import bll.PublicPar;
public class SMSMain extends ListActivity {
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String message = intent.getStringExtra("message");
Log.d("receiver", "Got message: " +message );
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sms_main);
Button btnAddRule = (Button) findViewById(R.id.btnAddRule);
btnAddRule.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent().setClass(getApplicationContext(),
ui.StepName.class);
startActivityForResult(intent, 20);
}
});
Button btnToMore = (Button) findViewById(R.id.btnToMore);
btnToMore.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(PublicPar.LocalBroadcastForRule);
intent.putExtra("message", "This is A!");
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
}
});
findViewById(R.id.btnClose).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
new IntentFilter(PublicPar.LocalBroadcastForRule));
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
}
}
StepName.java
package ui;
import info.dodata.smsforward.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import bll.PublicPar;
public class StepName extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sms_step_name);
Button btnNext = (Button) findViewById(R.id.btnNext);
btnNext.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(PublicPar.LocalBroadcastForRule);
intent.putExtra("message", "This is B!");
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
finish();
}
});
}
}
解决方案
If you want to receive the LocalBroadcast in various different activities, you will have to register the receiver in all those receiving activities. The Sender activity sends/broadcasts notifications and the receiver activity that watches for notifications has to register the Broadcast Receiver for receiving the notifications.
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