无法为 android 中更改的 SeekBar 值生成 QR 码

Question

我想 create/generate QRCode 为 Stream_Ring 更改的 SeekBar 值。但问题是我无法 get/save onProgressChanged 方法的 progress 生成 QR 所需的值。

我试图找出问题所在，但无法找到。为了您的方便，我上传了整个二维码生成代码。

    Button gene;
    ImageView image;
    SeekBar ring_bar;
    String collect;
    private AudioManager am;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_prof);

        gene = (Button) findViewById(R.id.gene);
        image = (ImageView) findViewById(R.id.image);
        ring_bar = (SeekBar) findViewById(R.id.ring_bar);
        am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

        int maxV = am.getStreamMaxVolume(AudioManager.STREAM_RING);
        int curV = am.getStreamVolume(AudioManager.STREAM_RING);
        ring_bar.setMax(maxV);
        ring_bar.setProgress(curV);
        ring_bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onStopTrackingTouch(SeekBar arg0) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar arg0) {
            }

            @Override
            public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {
                am.setStreamVolume(AudioManager.STREAM_RING, progress, 0);
            }
        });

        int ring = ring_bar.getProgress();

        String ringgg = Integer.toString(ring);

        collect = ringgg;

        gene.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
                try{
                    BitMatrix bitMatrix = multiFormatWriter.encode(collect, BarcodeFormat.QR_CODE,200,200);
                    BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
                    Bitmap bitmap = barcodeEncoder.createBitmap(bitMatrix);
                    image.setImageBitmap(bitmap);
                }
                catch (WriterException e){
                    e.printStackTrace();
                }

            }
        });
    }

}

Answer 1

问题是，我在 onCreate 中保存了进度，但之后我从未更新过该值。为了为当前值创建一个二维码，我不得不在 onClickListener 中调用 getProgress() ，它返回了进度条的当前值。

gene.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

    MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
    try{
        int ringtoneVolumeValue = ring_bar.getProgress();
        String ringtoneVolume = Integer.toString(ringtoneVolumeValue);
        BitMatrix bitMatrix = multiFormatWriter.encode(ringtoneVolume, BarcodeFormat.QR_CODE,200,200);
        //....
    }
    catch (WriterException e){
        e.printStackTrace();
    }

}

});

无法为 android 中更改的 SeekBar 值生成 QR 码

Unable to generate QR Code for changed SeekBar value in android

android

qr-code

seekbar

android-audiomanager