如何使用qwidget 在安卓设备上播放视频文件
时间: 2023-08-16 18:03:34 浏览: 50
在安卓设备上,可以使用Qt Android Extras模块中的QAndroidJniObject类来调用Android原生API实现视频播放。下面是一个简单的例子:
```cpp
#include <QtAndroidExtras>
#include <QAndroidJniEnvironment>
#include <QAndroidJniObject>
void playVideo()
{
QAndroidJniObject activity = QtAndroid::androidActivity();
// 调用Android Intent来选择视频文件
QAndroidJniObject intent("android/content/Intent",
"(Ljava/lang/String;)V",
QAndroidJniObject::fromString("android.intent.action.OPEN_DOCUMENT"));
intent.callObjectMethod("setType", "(Ljava/lang/String;)Landroid/content/Intent;",
QAndroidJniObject::fromString("video/*").object());
QAndroidJniObject chooser = QAndroidJniObject::callStaticObjectMethod("android/content/Intent",
"createChooser",
"(Landroid/content/Intent;Ljava/lang/CharSequence;)Landroid/content/Intent;",
intent.object(),
QAndroidJniObject::fromString("Select Video").object());
jint requestCode = 101;
activity.callObjectMethod("startActivityForResult", "(Landroid/content/Intent;I)V", chooser.object(), requestCode);
// 在onActivityResult中获取选择的视频文件路径并开始播放
}
void onActivityResult(int requestCode, int resultCode, const QAndroidJniObject &data)
{
if (requestCode == 101 && resultCode == -1) {
QAndroidJniObject uri = data.callObjectMethod("getData", "()Landroid/net/Uri;");
QAndroidJniObject contentResolver = QtAndroid::androidContext().callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
QAndroidJniObject fileDescriptor = contentResolver.callObjectMethod("openFileDescriptor", "(Landroid/net/Uri;Ljava/lang/String;)Ljava/io/FileDescriptor;", uri.object(), QAndroidJniObject::fromString("r").object());
jint fd = fileDescriptor.callMethod<jint>("getFileDescriptor");
jlong offset = 0;
jlong length = fileDescriptor.callMethod<jlong>("getLength");
QAndroidJniEnvironment env;
jclass mediaPlayerClass = env->FindClass("android/media/MediaPlayer");
jmethodID mediaPlayerCreateMethodID = env->GetStaticMethodID(mediaPlayerClass, "create", "()Landroid/media/MediaPlayer;");
jobject mediaPlayerObj = env->CallStaticObjectMethod(mediaPlayerClass, mediaPlayerCreateMethodID);
jmethodID setDataSourceMethodID = env->GetMethodID(mediaPlayerClass, "setDataSource", "(Ljava/io/FileDescriptor;JJ)V");
env->CallVoidMethod(mediaPlayerObj, setDataSourceMethodID, fd, offset, length);
jmethodID prepareMethodID = env->GetMethodID(mediaPlayerClass, "prepare", "()V");
env->CallVoidMethod(mediaPlayerObj, prepareMethodID);
jmethodID startMethodID = env->GetMethodID(mediaPlayerClass, "start", "()V");
env->CallVoidMethod(mediaPlayerObj, startMethodID);
env->DeleteLocalRef(mediaPlayerClass);
}
}
```
以上代码调用了Android Intent来选择视频文件,并在onActivityResult中获取选择的视频文件路径。然后使用Android MediaPlayer类来播放视频文件。需要注意的是,需要使用JNI接口来调用Android原生API,这需要一定的JNI编程知识。同时,需要在AndroidManifest.xml文件中添加相应的权限和Activity声明。