Android实现画中画功能(图片)
作者:tracydragonlxy
简介: Android 8.0(API 级别 26)允许以画中画 (PIP) 模式启动 Activity。画中画是一种特殊类型的多窗口模式,最常用于视频播放。使用该模式,用户可以通过固定到屏幕一角的小窗口观看视频,同时在应用之间进行导航或浏览主屏幕上的内容。
画中画窗口会显示在屏幕的最上层,位于系统选择的一角。您可以将画中画窗口拖动到其他位置(会自动贴边)。当您点按该窗口时,会看到两个特殊的控件:全屏切换开关(位于窗口的中心)和关闭按钮(右上角的“X”)。
效果图:
1、声明对画中画的支持:
默认情况下,系统不会自动为应用提供画中画支持。如果您想在应用中支持画中画,可以通过将 android:supportsPictureInPicture 设置为 true,在清单中注册视频 Activity。此外,指定您的 Activity 处理布局配置更改,这样一来,在画中画模式转换期间发生布局更改时,您的 Activity 就不会重新启动。
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.csu.pictureinpicture"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme" tools:ignore="GoogleAppIndexingWarning"> <activity android:name=".TestPipActivity" android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation" android:resizeableActivity="true" android:supportsPictureInPicture="true"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
2、将 Activity 切换到画中画模式:
如要进入画中画模式,Activity 必须调用enterPictureInPictureMode() 。
ivPip.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int ivWidth = imageViewPip.getWidth(); int ivHeight = imageViewPip.getHeight(); if (ivWidth != 0 && ivHeight != 0) { // 设置宽高比例值,第一个参数表示分子,第二个参数表示分母 // 10/5=2,表示画中画窗口的宽度是高度的两倍 Rational rational = new Rational(ivWidth, ivHeight); mBuilder.setAspectRatio(rational).build(); } enterPictureInPictureMode(mBuilder.build()); } });
3、处理画中画模式下的界面元素
当 Activity 进入或退出画中画模式时,系统会调用 Activity.onPictureInPictureModeChanged() 或 Fragment.onPictureInPictureModeChanged() 。在画中画模式下,Activity 会在一个小窗口中显示。在画中画模式下,用户无法与界面元素互动,并且可能很难看清小界面元素的详细信息。在 Activity 进入画中画模式之前移除其他界面元素,并在 Activity 再次变为全屏时恢复这些元素:
@Override public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) { super.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig); Log.i(TAG, "onPictureInPictureModeChanged: " + isInPictureInPictureMode); if (isInPictureInPictureMode) { // hide some ui tvTitle.setVisibility(View.INVISIBLE); tvDetail.setVisibility(View.INVISIBLE); tvInfo.setVisibility(View.INVISIBLE); ivPip.setVisibility(View.INVISIBLE); imageView.setVisibility(View.INVISIBLE); imageViewPip.setVisibility(View.VISIBLE); } else { // Restore the full-screen UI tvTitle.setVisibility(View.VISIBLE); tvDetail.setVisibility(View.VISIBLE); tvInfo.setVisibility(View.VISIBLE); ivPip.setVisibility(View.VISIBLE); imageView.setVisibility(View.VISIBLE); imageViewPip.setVisibility(View.INVISIBLE); } }
完整代码:
页面布局文件:
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.csu.pictureinpicture.TestPipActivity"> <ImageView android:id="@+id/image_view_pip" android:layout_width="300dp" android:layout_height="200dp" android:src="@mipmap/image" android:scaleType="centerCrop" android:visibility="invisible" app:layout_constraintTop_toTopOf="parent" app:layout_constraintLeft_toLeftOf="parent"/> <TextView android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="图片画中画演示" android:textSize="24sp" android:textColor="#353535" android:layout_marginTop="50dp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent"/> <ImageView android:id="@+id/image_view" android:layout_width="0dp" android:layout_height="300dp" android:src="@mipmap/image" android:scaleType="centerCrop" android:layout_marginTop="60dp" app:layout_constraintTop_toBottomOf="@id/tv_title" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent"/> <ImageView android:id="@+id/iv_pip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/pip" android:layout_marginEnd="10dp" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="@id/image_view" app:layout_constraintBottom_toBottomOf="@id/image_view"/> <TextView android:id="@+id/tv_detail" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="detail" android:textSize="14sp" android:lineSpacingMultiplier="1.5" android:layout_marginStart="10dp" android:layout_marginTop="10dp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintTop_toBottomOf="@id/image_view"/> <TextView android:id="@+id/tv_info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="SDK Version" android:layout_marginBottom="10dp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintBottom_toBottomOf="parent"/> </androidx.constraintlayout.widget.ConstraintLayout>
Activity文件:
import androidx.appcompat.app.AppCompatActivity; import androidx.constraintlayout.widget.ConstraintLayout; import androidx.constraintlayout.widget.Constraints; import android.app.PictureInPictureParams; import android.content.res.Configuration; import android.os.Bundle; import android.os.Build; import android.util.Log; import android.util.Rational; import android.view.View; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; public class TestPipActivity extends AppCompatActivity { private static final String TAG = "TestPipActivity"; private TextView tvTitle, tvInfo, tvDetail; private ImageView imageView, imageViewPip, ivPip; private PictureInPictureParams.Builder mBuilder; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test_pip); tvTitle = findViewById(R.id.tv_title); tvDetail = findViewById(R.id.tv_detail); tvInfo = findViewById(R.id.tv_info); imageView = findViewById(R.id.image_view); ivPip = findViewById(R.id.iv_pip); imageViewPip = findViewById(R.id.image_view_pip); tvDetail.setText("Name: kobe.png\r\nSize: 75.7KB(480px * 300px)\r\nDate: 2020/09/17 15:40"); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && getPackageManager().hasSystemFeature(PackageManager.FEATURE_PICTURE_IN_PICTURE)) { mBuilder = new PictureInPictureParams.Builder(); ivPip.setVisibility(View.VISIBLE); tvInfo.setText("SDK Version:" + Build.VERSION.SDK_INT + "(支持画中画模式)"); } else { ivPip.setVisibility(View.INVISIBLE); tvInfo.setText("SDK Version:" + Build.VERSION.SDK_INT + "(不支持画中画模式)"); } ivPip.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int ivWidth = imageViewPip.getWidth(); int ivHeight = imageViewPip.getHeight(); if (ivWidth != 0 && ivHeight != 0) { // 设置宽高比例值,第一个参数表示分子,第二个参数表示分母 // 10/5=2,表示画中画窗口的宽度是高度的两倍 Rational rational = new Rational(ivWidth, ivHeight); mBuilder.setAspectRatio(rational).build(); } enterPictureInPictureMode(mBuilder.build()); } }); } @Override public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) { super.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig); Log.i(TAG, "onPictureInPictureModeChanged: " + isInPictureInPictureMode); if (isInPictureInPictureMode) { // hide some ui tvTitle.setVisibility(View.INVISIBLE); tvDetail.setVisibility(View.INVISIBLE); tvInfo.setVisibility(View.INVISIBLE); ivPip.setVisibility(View.INVISIBLE); imageView.setVisibility(View.INVISIBLE); imageViewPip.setVisibility(View.VISIBLE); } else { // Restore the full-screen UI tvTitle.setVisibility(View.VISIBLE); tvDetail.setVisibility(View.VISIBLE); tvInfo.setVisibility(View.VISIBLE); ivPip.setVisibility(View.VISIBLE); imageView.setVisibility(View.VISIBLE); imageViewPip.setVisibility(View.INVISIBLE); } } }
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