在Android项目中使用RemoteViews实现跨进程更新界面
在Android项目中使用RemoteViews实现跨进程更新界面?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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实现效果图
在同一个应用中有两个Activity,MainActivity和Temp2Activity,这两个Activity不在同一个进程中。
现在需要通过Temp2Activity来改变MainActivity中的视图,即在MainActivity中添加两个Button,也就是实现跨进程更新UI这么一个功能。
在MainActivity里点击“跳转到新进程ACTIVITY”按钮,会启动一个新进程的Temp2Activity,我们先点击“绑定服务”,这样我们就启动了服务,再点击“AIDL更新”按钮,通过调用handler来实现跨进程更新UI,点击返回,我们发现MainActivity页面中新添加了两个按钮,并且按钮还具有点击事件。
三、核心代码
IremoteViewsManager.aidl
里面提供了两个方法,一个是根据id更新TextView里面的内容,一个是根据id添加view视图
// IremoteViewsManager.aidl.aidl package com.czhappy.remoteviewdemo; interface IremoteViewsManager { void addRemoteView(in RemoteViews remoteViews); }
RemoteViewsAIDLService.Java
package com.czhappy.remoteviewdemo.service; import android.app.Service; import android.content.Intent; import android.os.Binder; import android.os.Bundle; import android.os.IBinder; import android.os.Message; import android.os.RemoteException; import android.widget.RemoteViews; import com.czhappy.remoteviewdemo.IremoteViewsManager; import com.czhappy.remoteviewdemo.activity.MainActivity; /** * Description: * User: chenzheng * Date: 2017/2/10 0010 * Time: 10:56 */ public class RemoteViewsAIDLService extends Service { private static final String TAG = "RemoteViewsAIDLService"; private Binder remoteViewsBinder = new IremoteViewsManager.Stub(){ @Override public void addRemoteView(RemoteViews remoteViews) throws RemoteException { Message message = new Message(); message.what = 1; Bundle bundle = new Bundle(); bundle.putParcelable("remoteViews",remoteViews); message.setData(bundle); new MainActivity.MyHandler(RemoteViewsAIDLService.this,getMainLooper()).sendMessage(message); } }; public RemoteViewsAIDLService() { } @Override public IBinder onBind(Intent intent) { return remoteViewsBinder; } }
MainActivity.java
package com.czhappy.remoteviewdemo.activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.LinearLayout; import android.widget.RemoteViews; import android.widget.TextView; import com.czhappy.remoteviewdemo.R; import java.lang.ref.WeakReference; public class MainActivity extends AppCompatActivity { private static String TAG = "MainActivity"; private static LinearLayout mLinearLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLinearLayout = (LinearLayout) this.findViewById(R.id.mylayout); } public static class MyHandler extends Handler { WeakReferenceweakReference; public MyHandler(Context context, Looper looper) { super(looper); weakReference = new WeakReference<>(context); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); Log.i(TAG, "handleMessage"); switch (msg.what) { case 1: //RemoteViews的AIDL实现 RemoteViews remoteViews = msg.getData().getParcelable("remoteViews"); if (remoteViews != null) { Log.i(TAG, "updateUI"); View view = remoteViews.apply(weakReference.get(), mLinearLayout); mLinearLayout.addView(view); } break; default: break; } } }; public void readyGo(View view){ Intent intent = new Intent(MainActivity.this, Temp2Activity.class); startActivity(intent); } }
Temp2Activity.java
package com.czhappy.remoteviewdemo.activity; import android.app.PendingIntent; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.os.RemoteException; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.RemoteViews; import com.czhappy.remoteviewdemo.IremoteViewsManager; import com.czhappy.remoteviewdemo.R; import com.czhappy.remoteviewdemo.service.RemoteViewsAIDLService; /** * Description: * User: chenzheng * Date: 2017/2/9 0009 * Time: 16:05 */ public class Temp2Activity extends AppCompatActivity { private String TAG = "Temp2Activity"; private IremoteViewsManager remoteViewsManager; private boolean isBind = false; private ServiceConnection remoteViewServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { Log.i(TAG,"onServiceConnected"); remoteViewsManager = IremoteViewsManager.Stub.asInterface(service); } @Override public void onServiceDisconnected(ComponentName name) { //回收 remoteViewsManager = null; } }; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.activity_temp); } /** * 绑定服务 */ public void bindService(View view) { Intent viewServiceIntent = new Intent(this,RemoteViewsAIDLService.class); isBind = bindService(viewServiceIntent,remoteViewServiceConnection, Context.BIND_AUTO_CREATE); } /** * 更新UI */ public void UpdateUI(View view){ RemoteViews remoteViews = new RemoteViews(Temp2Activity.this.getPackageName(),R.layout.button_layout); Intent intentClick = new Intent(Temp2Activity.this,FirstActivity.class); PendingIntent openFirstActivity = PendingIntent.getActivity(Temp2Activity.this,0,intentClick,0); remoteViews.setOnClickPendingIntent(R.id.firstButton,openFirstActivity); Intent secondClick = new Intent(Temp2Activity.this,SecondActivity.class); PendingIntent openSecondActivity = PendingIntent.getActivity(Temp2Activity.this,0,secondClick,0); remoteViews.setOnClickPendingIntent(R.id.secondButton,openSecondActivity); remoteViews.setCharSequence(R.id.secondButton,"setText","想改就改"); try { remoteViewsManager.addRemoteView(remoteViews); } catch (RemoteException e) { e.printStackTrace(); } } @Override protected void onDestroy() { super.onDestroy(); if(isBind){ unbindService(remoteViewServiceConnection); isBind = false; } } }
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
四、总结
RemoteViews就是为跨进程更新UI而生的,内部封装了很多方法用来实现跨进程更新UI。但这并不代表RemoteViews是就是万能的了,它也有不足之处,目前支持的布局和View有限
layout:
FrameLayout LinearLayout RelativeLayout GridLayout
View:
AnalogClock button Chronometer ImageButton ImageView ProgressBar TextView ViewFlipper ListView GridView StackView AdapterViewFlipper ViewStub
不支持自定义View 所以具体使用RemoteViews还是aidl或者BroadCastReceiver还得看实际的需求。
看完上述内容,你们掌握在Android项目中使用RemoteViews实现跨进程更新界面的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注创新互联行业资讯频道,感谢各位的阅读!
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