Java 检查Android中的视频有多长？

因此，我希望应用程序在我单击按钮时打开我的视频，然后将视频或目录保存在变量中，然后使用该变量检查视频的长度。这是我目前的代码：

    public void SevenSecVideo(){
    SevenSecVideo = (Button)findViewById(R.id.SevenSecondBtn);//Finds the button in design and put it into a button variable.
    SevenSecVideo.setOnClickListener(//Listens for a button click.
            new View.OnClickListener() {//Creates a new click listener.
                @Override
                public void onClick(View v) {

                    Intent mediaChooser = new Intent(Intent.ACTION_GET_CONTENT);
                    //comma-separated MIME types
                    mediaChooser.setType("video/*");
                    startActivityForResult(mediaChooser, RESULT_LOAD_IMAGE);
                }
            }
    );
}


@Override
public void onActivityReenter(int resultCode, Intent data) {
    super.onActivityReenter(resultCode, data);

    if(resultCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null){
        //gets the address of the image/data !!!!!!ALSO CAN HOLD THE ADDRESS FOR THE SERVER!!!!!!.
        Uri SevenSecVideo = data.getData();

        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        retriever.setDataSource(String.valueOf(SevenSecVideo));
        String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
        long timeInMilliSec = Long.parseLong( time );
        long duration = timeInMilliSec / 1000;
        long hours = duration / 3600;
        long minutes = (duration - hours * 3600) / 60;
        long seconds = duration - (hours * 3600 + minutes * 60);

        if (seconds <= 7){
            Toast.makeText(this, "is 7 sec or less!", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(this, "is NOT 7 sec or less!", Toast.LENGTH_SHORT).show();
        }
    }
}

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祝酒人从不露面，怎么了？

看来你的病情不对

 if(resultCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK ...

---

resultCode

怎么可能同时等于

RESULT\u LOAD\u IMAGE

和

RESULT\u LOAD\u IMAGE

。

你的第二种方法是问题所在，它对图像而不是视频使用函数。

你应该在@Override method onActivityResult中编写第二个函数代码，如下所示

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null){
        //gets the address of the image/data !!!!!!ALSO CAN HOLD THE ADDRESS FOR THE SERVER!!!!!!.
        Uri SevenSecVideo = data.getData();
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        retriever.setDataSource(MainActivity.this,SevenSecVideo);
        String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
        long timeInMilliSec = Long.parseLong( time );
        long duration = timeInMilliSec / 1000;
        long hours = duration / 3600;
        long minutes = (duration - hours * 3600) / 60;
        long seconds = duration - (hours * 3600 + minutes * 60);

        if (seconds <= 7){
            Toast.makeText(this, "is 7 sec or less!", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(this, "is NOT 7 sec or less!", Toast.LENGTH_SHORT).show();
        }
    }
}

@覆盖
受保护的void onActivityResult（int请求代码、int结果代码、意图数据）{
super.onActivityResult（请求代码、结果代码、数据）；
if（requestCode==RESULT\u LOAD\u IMAGE&&resultCode==RESULT\u OK&&data！=null）{
//获取图像/数据的地址！！！！！还可以保存服务器的地址！！！！！！。
Uri SevenSecVideo=data.getData（）；
MediaMetadataRetriever retriever=新的MediaMetadataRetriever（）；
setDataSource（MainActivity.this，SevenSecVideo）；
字符串时间=retriever.extractMetadata（MediaMetadataRetriever.METADATA\u KEY\u DURATION）；
long-timeInMilliSec=long.parseLong（时间）；
长持续时间=毫秒/1000的时间；
长时间=持续时间/3600；
长分钟=（持续时间-小时*3600）/60；
长秒=持续时间-（小时*3600+分钟*60）；
如果（秒）我修复了if语句和TOAST仍然没有出现，我将更新问题并添加错误日志
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null){
        //gets the address of the image/data !!!!!!ALSO CAN HOLD THE ADDRESS FOR THE SERVER!!!!!!.
        Uri SevenSecVideo = data.getData();
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        retriever.setDataSource(MainActivity.this,SevenSecVideo);
        String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
        long timeInMilliSec = Long.parseLong( time );
        long duration = timeInMilliSec / 1000;
        long hours = duration / 3600;
        long minutes = (duration - hours * 3600) / 60;
        long seconds = duration - (hours * 3600 + minutes * 60);

        if (seconds <= 7){
            Toast.makeText(this, "is 7 sec or less!", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(this, "is NOT 7 sec or less!", Toast.LENGTH_SHORT).show();
        }
    }
}