Using broadcast for communication between Android components
Last Update:2015-07-09
Source: Internet
Author: User
<span id="Label3"></p><p><p>There are many ways to implement communication between Android components, and broadcast is one of Them. Communication between activity and fragment, broadcast use more This article takes an activity as an example.<br>Effect<br></p></p><p><p>Layout file:</p></p><pre class="prettyprint"><code class=" hljs xml"><span class="hljs-tag"><span class="hljs-tag"><<span class="hljs-title">linearlayout</span> <span class="hljs-attribute">xmlns:android</span>=<span class="hljs-value">"http://schemas.android.com/apk/res/android"</span> <span class="hljs-attribute"> Xmlns:tools</span>=<span class="hljs-value">"http://schemas.android.com/tools"</span><span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"match_parent" </span> <span class="hljs-attribute">android:layout_height</span>=<span class="hljs-value">"match_parent"</span><span class="hljs-attribute">android:orientation</span>=<span class="hljs-value">"vertical" </span>> </span></span> <span class="hljs-tag"><span class="hljs-tag"><<span class="hljs-title">textview </span> <span class="hljs-attribute">android:id </span> =<span class="hljs-value"> "@+id/textview1" </span> <span class="hljs-attribute">android:layout_width </span> =<span class="hljs-value"> "wrap_content" </span> <span class="hljs-attribute">android:layout_height </span> =<span class="hljs-value"> "wrap_content" </span> <span class="hljs-attribute">android:text </span> =<span class="hljs-value"> "@string/hello_world" </span>/> </span></span> <span class="hljs-tag"><span class="hljs-tag"><<span class="hljs-title">button</span><span class="hljs-attribute">android:id</span>=<span class="hljs-value">"@+id/button1"</span><span class="hljs-attribute">android:layout_width</span>=<span class="hljs-value">"wrap_ Content "</span><span class="hljs-attribute">android:layout_height</span>="<span class="hljs-value">wrap_content "</span><span class="hljs-attribute">android:layout_alignleft</span>=<span class="hljs-value">" @+id /textview1 "</span><span class="hljs-attribute">android:layout_marginleft</span>=<span class="hljs-value">" 27DP "</span><span class="hljs-attribute">android:layout_margintop</span>= <span class="hljs-value">"26dp"</span> <span class="hljs-attribute">android:text</span>=<span class="hljs-value">"send broadcast"</span> /> </span></span><span class="hljs-tag"><span class="hljs-tag"></<span class="hljs-title">linearlayout</span>></span></span></code></pre><p><p>Mainactivity.java</p></p><pre class="prettyprint"><code class=" hljs java"><span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-class"><span class="hljs-class"> <span class="hljs-keyword">class</span> <span class="hljs-title">mainactivity</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Activity</span> {</span></span> <span class="hljs-keyword"><span class="hljs-keyword">Private</span></span>Button btn;<span class="hljs-keyword"><span class="hljs-keyword">Private</span></span>TextView tv;<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword">protected</span></span> <span class="hljs-keyword"><span class="hljs-keyword">void</span></span> <span class="hljs-title"><span class="hljs-title">onCreate</span></span>(Bundle Savedinstancestate) {<span class="hljs-keyword"><span class="hljs-keyword">Super</span></span>. onCreate (savedinstancestate); Setcontentview (r.layout.activity_main); TV = (TextView)<span class="hljs-keyword"><span class="hljs-keyword"></span> this</span>. Findviewbyid (r.id.textview1);<span class="hljs-comment"><span class="hljs-comment">//receive broadcasts</span></span>Localbroadcastmanager Broadcastmanager = localbroadcastmanager. getinstance (mainactivity.<span class="hljs-keyword"><span class="hljs-keyword"></span> this</span>); Intentfilter Intentfilter =<span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Intentfilter (); Intentfilter.addaction (<span class="hljs-string"><span class="hljs-string">"com.example.test1"</span></span>); Broadcastreceiver Mitemviewlistclickreceiver =<span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Broadcastreceiver () {<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-keyword"><span class="hljs-keyword">void</span></span> <span class="hljs-title"><span class="hljs-title">OnReceive</span></span>(context context, Intent Intent) {tv.settext (<span class="hljs-string"><span class="hljs-string">"1111"</span></span>); } }; Broadcastmanager.registerreceiver (mitemviewlistclickreceiver, intentfilter); BTN = (Button)<span class="hljs-keyword"><span class="hljs-keyword"></span> this</span>. Findviewbyid (r.id.button1); Btn.setonclicklistener (<span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Onclicklistener () {<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-keyword"><span class="hljs-keyword">void</span></span> <span class="hljs-title"><span class="hljs-title">OnClick</span></span>(View V) {<span class="hljs-comment"><span class="hljs-comment">//send Broadcast</span></span>Intent Intent =<span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Intent (<span class="hljs-string"><span class="hljs-string">"com.example.test1"</span></span>); Localbroadcastmanager.getinstance (mainactivity.<span class="hljs-keyword"><span class="hljs-keyword"></span> this</span>). Sendbroadcast (intent); } }); }}</code></pre> <p style="font-size:12px;"><p style="font-size:12px;">Copyright Notice: This article for Bo Master original article, without Bo Master permission not Reproduced.</p></p> <p><p>Using broadcast for communication between Android components</p></p></span>
