我的屏幕上有5个矩形，底部有一个搜索栏（请参见下面的图像链接）。我试图通过移动搜索栏逐渐更改5个矩形中的4个（除灰色int中间右方）的颜色。我在RectAngle类中使用了drawRect方法来绘制5个矩形，但是我在另一个类（GloblaUIVariables类）中实例化了它们以使其具有全局性，但是当我将搜索栏向右移动时，什么也没有发生。我在干什么谢谢你的帮助。
Screen Image
这是我的RectAngle类：
public class RectAngle extends View {
public RectAngle(Context context) {
super(context);
}
public RectAngle(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RectAngle(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float x = getWidth();
float y = getHeight();
// Draw the top left rectangle
GlobalUIVariables.topLeftRect.setStyle(Paint.Style.FILL);
GlobalUIVariables.topLeftRect.setColor(Color.parseColor("#66FFFF"));
// canvas.drawPaint(topLeftRect);
canvas.drawRect(0, 0, x / 2, y / 2, GlobalUIVariables.topLeftRect);
//Draw the bottom left rectangle
GlobalUIVariables.bottomLeftRect.setStyle(Paint.Style.FILL);
//bottomLeftRect.setColor(Color.WHITE);
// canvas.drawPaint(bottomLeftRect);
GlobalUIVariables.bottomLeftRect.setColor(Color.parseColor("#FFFF00"));
canvas.drawRect(0, y / 2, x / 2, y, GlobalUIVariables.bottomLeftRect);
//Draw the top tight rectangle
GlobalUIVariables.topRightRect.setStyle(Paint.Style.FILL);
//topRightRect.setColor(Color.WHITE);
GlobalUIVariables.topRightRect.setColor(Color.parseColor("#FF6600"));
//canvas.drawPaint(topRightRect);
canvas.drawRect(x / 2, 0, x, y / 3, GlobalUIVariables.topRightRect);
// Draw the middle right rectangle
GlobalUIVariables.midRightRect.setStyle(Paint.Style.FILL);
GlobalUIVariables.midRightRect.setColor(Color.parseColor("#808080"));
// canvas.drawPaint(midRightRect);
canvas.drawRect(x / 2, y/3, x, 2*y / 3, GlobalUIVariables.midRightRect);
//Draw the bottom right rectangle
GlobalUIVariables.bottomRightRect.setStyle(Paint.Style.FILL);
//bottomRightRect.setColor(Color.WHITE);
GlobalUIVariables.bottomRightRect.setColor(Color.parseColor("#CCCC00"));
// canvas.drawPaint(bottomRightRect);
canvas.drawRect(x/2, 2*y/3, x, y, GlobalUIVariables.bottomRightRect);
}
}
这是我的主要活动课：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(new RectAngle(this));
setContentView(R.layout.activity_main);
SeekBar seekBar;
RectAngle rect;
seekBar = (SeekBar)findViewById(R.id.seekBar);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
RectAngle rect;
rect = (RectAngle)findViewById(R.id.rectangle);
rect.postInvalidate();
GlobalUIVariables.topLeftRect.setStyle(Paint.Style.FILL);
GlobalUIVariables.topLeftRect.setColor(Color.rgb(23 - progress, 200 + progress, 99 + progress));
GlobalUIVariables.bottomLeftRect.setColor(Color.rgb(255, 133 + progress, 144 - progress));
GlobalUIVariables.topRightRect.setColor((Color.rgb(88 + progress, 200 - progress, 177 + progress)));
GlobalUIVariables.bottomRightRect.setColor(Color.rgb(230, 56 + progress, 233 - progress));
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是我的GlobalUIVariables类：
public class GlobalUIVariables extends Application {
public static Paint topLeftRect = new Paint();
public static Paint bottomLeftRect = new Paint();
public static Paint topRightRect = new Paint();
public static Paint midRightRect = new Paint();
public static Paint bottomRightRect = new Paint();
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".MainActivity">
<com.example.hassan.modernartui.RectAngle
android:id="@+id/rectangle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/seekBar"/>
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/seekBar"
android:max="100"
android:indeterminate="false"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="false"
android:layout_alignParentEnd="false" />
</RelativeLayout>
最佳答案
从一开始就设置油漆（创建视图时）。这样，我们还可以摆脱使用应用程序类GlobalUIVariables的用法。这里介绍了如何将这些数据放入视图中，第2步将向您展示如何更改它们：
将油漆放在RectAngle类中
public class RectAngle extends View {
public Paint topLeftRect, bottomLeftRect, topRightRect, midRightRect, bottomRightRect;
public RectAngle(Context context) {
super(context);
initPaints();
}
public RectAngle(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RectAngle(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initPaints();
}
void initPaints(){
topLeftRect = new Paint();
bottomLeftRect = new Paint();
topRightRect = new Paint();
midRightRect = new Paint();
bottomRightRect = new Paint();
topLeftRect.setStyle(Paint.Style.FILL);
topLeftRect.setColor(Color.parseColor("#66FFFF"));
bottomLeftRect.setStyle(Paint.Style.FILL);
bottomLeftRect.setColor(Color.parseColor("#FFFF00"));
topRightRect.setStyle(Paint.Style.FILL);
topRightRect.setColor(Color.parseColor("#FF6600"));
midRightRect.setStyle(Paint.Style.FILL);
midRightRect.setColor(Color.parseColor("#808080"));
bottomRightRect.setStyle(Paint.Style.FILL);
bottomRightRect.setColor(Color.parseColor("#CCCC00"));
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float x = getWidth();
float y = getHeight();
// Draw the top left rectangle
canvas.drawRect(0, 0, x / 2, y / 2, topLeftRect);
//Draw the bottom left rectangle
canvas.drawRect(0, y / 2, x / 2, y, bottomLeftRect);
//Draw the top tight rectangle
canvas.drawRect(x / 2, 0, x, y / 3, topRightRect);
// Draw the middle right rectangle
canvas.drawRect(x / 2, y/3, x, 2*y / 3, midRightRect);
//Draw the bottom right rectangle
canvas.drawRect(x/2, 2*y/3, x, y, bottomRightRect);
}
}
修复滑块侦听器，以更改视图（而非应用程序类）中的颜色，然后调用
invalidatefinal RectAngle rectAngleView = (RectAngle) findViewById(R.id.rectangle);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
rectAngleView.topLeftRect.setColor(Color.rgb(23 - progress, 200 + progress, 99 + progress));
rectAngleView.bottomLeftRect.setColor(Color.rgb(255, 133 + progress, 144 - progress));
rectAngleView.topRightRect.setColor((Color.rgb(88 + progress, 200 - progress, 177 + progress)));
rectAngleView.bottomRightRect.setColor(Color.rgb(230, 56 + progress, 233 - progress));
rectAngleView.invalidate();
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
希望这可以帮助。