Android Open Source - opentok-android-sdk-samples Meter View

From Project

Back to project page opentok-android-sdk-samples.

License

The source code is released under:

Apache License

If you think the Android project opentok-android-sdk-samples listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.opentok.android.demo.ui;
/*from   ww w  .  ja  v  a2s  .c o m*/
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RadialGradient;
import android.graphics.Rect;
import android.graphics.Shader.TileMode;
import android.support.v4.view.MotionEventCompat;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class MeterView extends View {

  Context mContext;
  float mValue = 0;
  Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  Paint mPaintGradient = new Paint(Paint.ANTI_ALIAS_FLAG);
  Rect mBounds = new Rect();
  Bitmap mIconOn;
  Bitmap mIconOff;
  boolean mMute = false;
  OnClickListener mListener;

  public interface OnClickListener {
    public void onClick(MeterView view);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawCircle(mBounds.centerX(), mBounds.centerY(),
        mBounds.width() * 0.5f, mPaint);

    if (!mMute) {
      if (mIconOn != null) {
        canvas.drawBitmap(mIconOn,
            mBounds.centerX() - mIconOn.getWidth() * 0.5f,
            mBounds.centerY() - mIconOn.getHeight() * 0.5f, mPaint);
      }
      canvas.drawCircle(mBounds.centerX(), mBounds.centerY(),
          mBounds.width() * 0.5f * mValue, mPaintGradient);

    } else {
      if (mIconOff != null) {
        canvas.drawBitmap(mIconOff,
            mBounds.centerX() - mIconOff.getWidth() * 0.5f,
            mBounds.centerY() - mIconOff.getHeight() * 0.5f, mPaint);
      }
    }

  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mBounds.left = (int) (0 + w * 0.10);
    mBounds.top = (int) (0 + h * 0.10);
    mBounds.right = (int) (w * 0.90);
    mBounds.bottom = (int) (h * 0.90);
    // Update gradient
    mPaintGradient.setShader(new RadialGradient(w / 2, h / 2, h / 2,
        0xff98CE00, 0x8098CE00, TileMode.CLAMP));

  }

  private void init() {
    mPaint.setStyle(Style.FILL);
    mPaint.setColor(0xff1f1f1f);
    mPaintGradient.setStyle(Style.FILL);
    mPaintGradient.setColor(0xff98CE00);
  }

  public MeterView(Context context) {
    super(context);
    mContext = context;
    init();
  }

  public MeterView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    init();
  }

  public void setIcons(Bitmap iconOn, Bitmap iconOff) {
    mIconOn = iconOn;
    mIconOff = iconOff;
  }

  public void setMeterValue(float value) {
    // Convert linear value to logarithmic
    double db = 20 * Math.log10(value);
    float floor = -40;
    float level = 0;
    if (db > floor) {
      level = (float) db - floor;
      level /= -floor;
    }
    mValue = level;
    // force redraw
    invalidate();
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    int action = MotionEventCompat.getActionMasked(event);

    switch (action) {
    case (MotionEvent.ACTION_DOWN):
      mMute = !mMute;
      if (mListener != null) {
        mListener.onClick(this);
      }
      return true;
    default:
      return super.onTouchEvent(event);
    }
  }

  public boolean isMuted() {
    return mMute;
  }

  public void setOnClickListener(OnClickListener listener) {
    mListener = listener;
  }
}

Java Source Code List