如何解决Android 工作室中的视频播放器
我对此完全陌生，但对于我的研究生工作，我决定至少创建一个视频播放器。我最终编写了这段代码。使用图库可打开图像，但无法在 VideoView 中打开视频。
请帮忙(ฅ'ω'ฅ)
MainActivity.java
package com.example.vpbaimbve;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import java.io.FileNotFoundException;
import java.io.InputStream;
import android.net.Uri;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.VideoView;
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
private final int Pick_image = 1;
private VideoView videoView;
private final int Pick_video = 2;
MediaController mediaController;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Связываемся ImageView:
imageView = (ImageView)findViewById(R.id.imageView);
//Связываемся VideoView:
videoView = (VideoView)findViewById(R.id.videoView2);
//Связываемся с нашей кнопкой Button:
Button PickImage = (Button) findViewById(R.id.button);
//Настраиваем для нее обработчик нажатий OnClickListener:
PickImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
//Вызываем стандартную галерею для выбора изображения с помощью Intent.ACTION_PICK:
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
//Тип получаемых объектов - :
photoPickerIntent.setType("*/*");
photoPickerIntent.putExtra(Intent.EXTRA_MIME_TYPES,new String[] {"image/*","video/*"});
//Запускаем переход с ожиданием обратного результата в виде информации об изображении:
startActivityForResult(photoPickerIntent,Pick_image);
}
});
}
//Обрабатываем результат выбора в галерее:
@Override
protected void onActivityResult(int requestCode,int resultCode,Intent imageReturnedIntent) {
super.onActivityResult(requestCode,resultCode,imageReturnedIntent);
switch(requestCode) {
case Pick_image:
if(resultCode == RESULT_OK){
try {
//Получаем URI изображения,преобразуем его в Bitmap
//объект и отображаем в элементе ImageView нашего интерфейса:
final Uri imageUri = imageReturnedIntent.getData();
final InputStream imageStream = getContentResolver().openInputStream(imageUri);
final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
imageView.setImageBitmap(selectedImage);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
switch (requestCode) {
case Pick_video:
if (requestCode == RESULT_OK) {
final VideoView videoView2;
videoView = (VideoView) findViewById(R.id.videoView2);
mediaController = new MediaController(this);
videoView.setVideoPath(String.valueOf(Pick_video));
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
videoView.start();
}
}
}
}
acyivity_main.xml
<?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=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:maxHeight="200dp"
android:src="@mipmap/ic_launcher"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.912"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.928"
app:srcCompat="@android:drawable/divider_horizontal_textfield" />
<Button
android:id="@+id/button"
android:layout_width="161dp"
android:layout_height="57dp"
android:layout_gravity="center"
android:fontFamily="@font/black_ops_one"
android:text="Open Video"
app:backgroundTint="#651FFF"
app:backgroundTintMode="add"
app:icon="@android:drawable/ic_media_play"
app:iconPadding="@dimen/cardview_compat_inset_shadow"
app:iconTintMode="screen"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.064"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.921"
app:strokeColor="#000000" />
<VideoView
android:id="@+id/videoView2"
android:layout_width="wrap_content"
android:layout_height="581dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
构建没有报错，应用程序正常安装在手机上，运行正常。该项目是在 android 4.1 上创建的。我正在测试 android 10（没有较小版本的手机（我有一个 amd 处理器 xd（抱歉我的英语））
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