Widget中PendingIntent和RemoteViews用法

最新推荐文章于 2020-07-20 23:11:29 发布

RaylnGuan

最新推荐文章于 2020-07-20 23:11:29 发布

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本文链接：https://blog.youkuaiyun.com/rayln/article/details/39152721

本文介绍如何利用PendingIntent在Android应用中创建交互式小部件。通过具体的代码示例展示了如何为小部件按钮设置点击事件，当用户点击按钮时会启动特定的活动。

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PendingIntent是指把Intent包装了一层, 并且把PendingIntent放入一个新的进程. 通过触发事件去触发这个PendingIntent.

创建PendingIntent方法.
1. getActivity(Context context, int requestCode, Intent intent, int flags)

2. getBroadcast(Context context, int requestCode, Intent intent, int flags)

3. getService(Context context, int requestCode, Intent intent, int flags)

例子:
在/res/xml中新建一个example_appwidget.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
	android:minWidth="294dp" android:minHeight="72dp"
	android:updatePeriodMillis="86400000" android:initialLayout="@layout/example_appwidget_info">

</appwidget-provider>

在/res/layout中新建一个example_widget.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="match_parent"
	android:layout_height="match_parent">
	<TextView android:text="firstWidgetText" android:background="#000000"
		android:id="@+id/widgetTextId" android:layout_width="fill_parent"
		android:layout_height="wrap_content"></TextView>
	<Button android:layout_width="match_parent" android:id="@+id/button1" android:text="Button" android:layout_height="wrap_content"></Button>

</LinearLayout>

main.xml的内容不变

ExampleAppWidgetProvider.java内容

package com.cn;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class ExampleAppWidgetProvider extends AppWidgetProvider {

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		System.out.println("onDeleted");
		super.onDeleted(context, appWidgetIds);
	}

	@Override
	public void onDisabled(Context context) {
		System.out.println("onDisabled");
		super.onDisabled(context);
	}

	@Override
	public void onEnabled(Context context) {
		System.out.println("onEnabled");
		super.onEnabled(context);
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		System.out.println("onReceive");
		super.onReceive(context, intent);
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		System.out.println("onUpdate");
		for (int i = 0; i < appWidgetIds.length; i++) {
			System.out.println(appWidgetIds[i]);
			//创建一个intent对象
			Intent intent = new Intent(context,TargetActivity.class);
			//创建一个PendingIntent
			PendingIntent pending = PendingIntent.getActivity(context, 0, intent, 0);
			RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.example_widget);
			//第一个参数用来指定绑定事件的id
			//第二个参数指定事件发生时, 哪个pendingIntent会被执行
			remoteViews.setOnClickPendingIntent(R.id.button1, pending);
			//第一个参数是更新哪个appwidget的id
			//第二个是传remoteView
			appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
		}
		super.onUpdate(context, appWidgetManager, appWidgetIds);
	}

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.cn"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="10" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Appwidget2Activity"
                  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="ExampleAppWidgetProvider">
        	<!-- 指定广播接收 -->
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"></action>
            </intent-filter>
            <!-- appwidget的源文件 -->
            <meta-data android:name="android.appwidget.provider" android:resource="@xml/example_appwidget_info"></meta-data>
        </receiver>
		<activity android:name="TargetActivity"></activity>
    </application>
</manifest>

TargetActivity.java内容

package com.cn;

import android.app.Activity;
import android.os.Bundle;

public class TargetActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

}