SEO外包-remoteview-remoteview RemoteViews的用法、remoteview

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remoteview RemoteViews的用法

发布时间:2021-05-16 13:58   来源:网络 关键词:remoteview

remoteview

RemoteViews所支持的View类型如下图所示(注意不支持下图中View的子类):
RemoteViews所支持的View的类型
RemoteViews没有提供findViewById方法,因为RemoteViews在远程进程中显示,因此无法直接访问里面的View元素,而必须通过RemoteViews所提供的一系列set方法来完成,部分set方法如下所示:

1:在Notification中的应用

示例代码如下:

    private Button button;    private Notification notification;    private NotificationManager notificationManager;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.ceshi);        button = findViewById(R.id.button);        Intent intent=new Intent(this, com.example.liang.arlvyou.lanjiazai.ar.MainActivity.class);        Intent remote=new Intent(this, RemoteActivity.class);        PendingIntent pendingIntent=PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);        PendingIntent remoteIntent=PendingIntent.getActivity(this,0,remote,PendingIntent.FLAG_UPDATE_CURRENT);        RemoteViews remoteViews=new RemoteViews(getPackageName(),R.layout.remoteview);        remoteViews.setTextViewText(R.id.textView2,"我是remoteview");        remoteViews.setImageViewResource(R.id.image,R.drawable.icon);        remoteViews.setOnClickPendingIntent(R.id.button2,remoteIntent);        notification=new Notification();//注意Notification创建得用new的方式了创建,因为        //如果用Builder的方式创建的话,在设置remoteview的时候会用到setCustomContentView方法,        //该方法需要api24才能使用,api版本太高了,但是使用new的方式就可以不用考虑低api的问题。        notification.icon=R.mipmap.ic_launcher;        notification.tickerText="hello,world";        notification.when=System.currentTimeMillis();        notification.contentView=remoteViews;        notification.contentIntent=pendingIntent;        notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                notificationManager.notify(1,notification);            }        });    }

remoteview文件中的内容如下:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="horizontal"              android:layout_width="match_parent"              android:layout__height="match_parent">    <TextView        android:text="TextView"        android:layout_width="100sp"        android:layout__height="wrap_content"        android:id="@+id/textView2"/>    <ImageView        android:layout_width="100sp"        android:layout__height="wrap_content"        android:id="@+id/image"/>    <Button        android:text="Button"        android:layout_width="100sp"        android:layout__height="wrap_content"        android:id="@+id/button2"/></LinearLayout>

2:在桌面小组件中的应用,直接运行应用就行,都不需要打开应用,桌面小组件就已经有了。

示例代码如下:

public class MyAppWidgetProvider extends AppWidgetProvider {    @Override    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {        Log.d("MyAppWidgetProvider", "调用了onUpdate方法");        Intent intent = new Intent(context, com.example.liang.arlvyou.lanjiazai.ar.MainActivity.class);        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.remoteview);        remoteViews.setImageViewResource(R.id.image, R.drawable.icon);        remoteViews.setTextViewText(R.id.textView2, "我是桌面小组件");        remoteViews.setOnClickPendingIntent(R.id.textView2, pendingIntent);        appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);//用updateAppWidget来更新remoteViews的状态    }}

在androidmanifest.xml文件中

...   <receiver android:name=".lanjiazai.MyAppWidgetProvider">            <meta-data                android:name="android.appwidget.provider" <!--name的值是固定的,只能是android.appwidget.provider-->                android:resource="@xml/widget"/>            <intent-filter>                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/><!--必须得有这个action-->            </intent-filter>        </receiver>...

在res的xml文件夹下创建桌面组件的信息文件,比如widget.xml,文件内容如下

<?xml version="1.0" encoding="utf-8"?><appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"    android:initialLayout="@layout/remoteview"    android:minWidth="100dp"    android:minHeight="100dp"    android:updatePeriodMillis="86400000"></appwidget-provider>

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