如何TextView在android中使用颜色选择器更改文本颜色和背景颜色。添加具有更改文本颜色和背景颜色功能的注释，从颜色选择器中选择颜色。
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5130 次
4 回答
9
下载这个项目导入它。选色器
右键单击项目--->属性---> android --->添加单击并添加下载项目。
- 创建新项目
布局注意：使用从下载的项目 res 文件夹中的颜色选择器的图像---> 可绘制
<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" > <EditText android:id="@+id/txNote" android:layout_width="200dip" android:layout_height="200dip" android:layout_centerInParent="true" android:text="@string/hello_world" /> <ImageView android:id="@+id/rightColorPicker" android:layout_width="@dimen/ambilwarna_hueWidth" android:layout_height="@dimen/ambilwarna_hsvHeight" android:layout_alignParentRight="true" android:layout_alignTop="@+id/txNote" android:scaleType="fitXY" android:src="@drawable/ambilwarna_hue" /> <ImageView android:id="@+id/leftColorPicker" android:layout_width="@dimen/ambilwarna_hueWidth" android:layout_height="@dimen/ambilwarna_hsvHeight" android:layout_alignParentLeft="true" android:layout_alignTop="@+id/txNote" android:scaleType="fitXY" android:src="@drawable/ambilwarna_hue" /> </RelativeLayout>活动
public class MainActivity extends Activity implements OnTouchListener { TextView txtNote; ImageView rightColorPicker,leftColorPicker; private int mAppWidgetId = 0 ; public static boolean flag; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txtNote=(TextView)findViewById(R.id.txNote); rightColorPicker=(ImageView)findViewById(R.id.rightColorPicker); leftColorPicker=(ImageView)findViewById(R.id.leftColorPicker); rightColorPicker.setOnTouchListener(this); leftColorPicker.setOnTouchListener(this); Intent intent = getIntent(); Bundle extras = intent.getExtras(); if (extras != null) { mAppWidgetId = extras.getInt( AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); } } @Override public boolean onTouch(View v, MotionEvent event) { switch (v.getId()) { case R.id.rightColorPicker: colorPicker(); flag=true; break; case R.id.leftColorPicker: colorPicker(); flag=false; break; default: break; } return false; } public void colorPicker() { // initialColor is the initially-selected color to be shown in the rectangle on the left of the arrow. // for example, 0xff000000 is black, 0xff0000ff is blue. Please be aware of the initial 0xff which is the alpha. ColorPickerDialog dialog = new ColorPickerDialog(this, 0xff0000ff, new OnAmbilWarnaListener() { // Executes, when user click Cancel button @Override public void onCancel(ColorPickerDialog dialog){ } // Executes, when user click OK button @Override public void onOk(ColorPickerDialog dialog, int color) { // Create an Intent to launch WidgetConfigurationActivity screen Intent intent = new Intent(getBaseContext(), MainActivity.class); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId); // This is needed to make this intent different from its previous intents intent.setData(Uri.parse("tel:/"+ (int)System.currentTimeMillis())); // Creating a pending intent, which will be invoked when the user // clicks on the widget PendingIntent pendingIntent = PendingIntent.getActivity(getBaseContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Getting an instance of WidgetManager AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getBaseContext()); if (flag) { txtNote.setBackgroundColor(color); } else { txtNote.setTextColor(color); } // // Instantiating the class RemoteViews with widget_layout RemoteViews views = new RemoteViews(getBaseContext().getPackageName(), R.layout.activity_main); // // // Setting the background color of the widget views.setInt(R.id.txNote, "setBackgroundColor", color); // // // Attach an on-click listener to the clock views.setOnClickPendingIntent(R.id.txNote,pendingIntent); // Tell the AppWidgetManager to perform an update on the app widget appWidgetManager.updateAppWidget(mAppWidgetId, views); // Return RESULT_OK from this activity Intent resultValue = new Intent(); resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId); setResult(RESULT_OK, resultValue); //finish(); } }); dialog.show(); } }
于 2013-06-11T05:58:03.533 回答
1
您可以参考以下内容。它可能与您的问题中发布的快照不完全相同。您可以使用以下内容并根据您的要求进行修改。
当您单击按钮颜色选择器对话框弹出。您可以选择颜色并单击中心圆圈。textview 文本颜色更改为选择的颜色。
public class MainActivity extends Activity implements ColorPickerDialog.OnColorChangedListener {
Button b1;
TextView tv;
Paint mPaint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPaint = new Paint();
tv = (TextView) findViewById(R.id.tv);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new ColorPickerDialog(MainActivity.this, MainActivity.this, mPaint.getColor()).show();
}
});
}
@Override
public void colorChanged(int color) {
// TODO Auto-generated method stub
tv.setTextColor(color);
}
}
选色器
public class ColorPickerDialog extends Dialog {
public interface OnColorChangedListener {
void colorChanged(int color);
}
private OnColorChangedListener mListener;
private int mInitialColor;
private static class ColorPickerView extends View {
private Paint mPaint;
private Paint mCenterPaint;
private final int[] mColors;
private OnColorChangedListener mListener;
ColorPickerView(Context c, OnColorChangedListener l, int color) {
super(c);
mListener = l;
mColors = new int[] {
0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00,
0xFFFFFF00, 0xFFFF0000
};
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setShader(s);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(32);
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(color);
mCenterPaint.setStrokeWidth(5);
}
private boolean mTrackingCenter;
private boolean mHighlightCenter;
@Override
protected void onDraw(Canvas canvas) {
float r = CENTER_X - mPaint.getStrokeWidth()*0.5f;
canvas.translate(CENTER_X, CENTER_X);
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
if (mTrackingCenter) {
int c = mCenterPaint.getColor();
mCenterPaint.setStyle(Paint.Style.STROKE);
if (mHighlightCenter) {
mCenterPaint.setAlpha(0xFF);
} else {
mCenterPaint.setAlpha(0x80);
}
canvas.drawCircle(0, 0,
CENTER_RADIUS + mCenterPaint.getStrokeWidth(),
mCenterPaint);
mCenterPaint.setStyle(Paint.Style.FILL);
mCenterPaint.setColor(c);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X*2, CENTER_Y*2);
}
private static final int CENTER_X = 100;
private static final int CENTER_Y = 100;
private static final int CENTER_RADIUS = 32;
private int floatToByte(float x) {
int n = java.lang.Math.round(x);
return n;
}
private int pinToByte(int n) {
if (n < 0) {
n = 0;
} else if (n > 255) {
n = 255;
}
return n;
}
private int ave(int s, int d, float p) {
return s + java.lang.Math.round(p * (d - s));
}
private int interpColor(int colors[], float unit) {
if (unit <= 0) {
return colors[0];
}
if (unit >= 1) {
return colors[colors.length - 1];
}
float p = unit * (colors.length - 1);
int i = (int)p;
p -= i;
// now p is just the fractional part [0...1) and i is the index
int c0 = colors[i];
int c1 = colors[i+1];
int a = ave(Color.alpha(c0), Color.alpha(c1), p);
int r = ave(Color.red(c0), Color.red(c1), p);
int g = ave(Color.green(c0), Color.green(c1), p);
int b = ave(Color.blue(c0), Color.blue(c1), p);
return Color.argb(a, r, g, b);
}
private int rotateColor(int color, float rad) {
float deg = rad * 180 / 3.1415927f;
int r = Color.red(color);
int g = Color.green(color);
int b = Color.blue(color);
ColorMatrix cm = new ColorMatrix();
ColorMatrix tmp = new ColorMatrix();
cm.setRGB2YUV();
tmp.setRotate(0, deg);
cm.postConcat(tmp);
tmp.setYUV2RGB();
cm.postConcat(tmp);
final float[] a = cm.getArray();
int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);
return Color.argb(Color.alpha(color), pinToByte(ir),
pinToByte(ig), pinToByte(ib));
}
private static final float PI = 3.1415926f;
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX() - CENTER_X;
float y = event.getY() - CENTER_Y;
boolean inCenter = java.lang.Math.sqrt(x*x + y*y) <= CENTER_RADIUS;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mTrackingCenter = inCenter;
if (inCenter) {
mHighlightCenter = true;
invalidate();
break;
}
case MotionEvent.ACTION_MOVE:
if (mTrackingCenter) {
if (mHighlightCenter != inCenter) {
mHighlightCenter = inCenter;
invalidate();
}
} else {
float angle = (float)java.lang.Math.atan2(y, x);
// need to turn angle [-PI ... PI] into unit [0....1]
float unit = angle/(2*PI);
if (unit < 0) {
unit += 1;
}
mCenterPaint.setColor(interpColor(mColors, unit));
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (mTrackingCenter) {
if (inCenter) {
mListener.colorChanged(mCenterPaint.getColor());
}
mTrackingCenter = false; // so we draw w/o halo
invalidate();
}
break;
}
return true;
}
}
public ColorPickerDialog(Context context,
OnColorChangedListener listener,
int initialColor) {
super(context);
mListener = listener;
mInitialColor = initialColor;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
OnColorChangedListener l = new OnColorChangedListener() {
public void colorChanged(int color) {
mListener.colorChanged(color);
dismiss();
}
};
setContentView(new ColorPickerView(getContext(), l, mInitialColor));
setTitle("Pick a Color");
}
}
activity_main.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv"
android:layout_above="@+id/button1"
android:layout_alignRight="@+id/button1"
android:layout_marginBottom="180dp"
android:text="@string/hello_world" />
</RelativeLayout>
您还可以使用https://code.google.com/p/android-color-picker/activity中的颜色选择 器
于 2013-06-10T11:49:17.550 回答
0
正如在这个问题中回答的那样：Android Color Picker有一个颜色选择器的例子。使用它你可以改变颜色：
Color colorPicket = Color.parse("color returned of color picket");
TextView textView = (TextView) v;
textView.setBackgroundColor(colorPicked); //if it returns in hex you can parse with COlor.par
textView.setTextColor(colorPicked);
看一看：Color.parseColor
于 2013-06-10T11:45:08.247 回答
0
我不知道你是如何从选择器中获取颜色的，所以我想你将它作为 RGB 颜色/十六进制的三元组来获取。那么你必须使用该方法setTextColor(int color)有很多可能性：
myTextView.setTextColor(Color.rgb(100,100,100)); //get color as a triplet RGB
myTextView.setTextColor(Color.parseColor("#FFFFFF")); //get color as hexadecimal String
要设置你的背景textView，只需使用方法setBackgroundColor(int color)（从View类继承）：
myTextView.setBackgroundColor(Color.rgb(100,100,100)); //example
于 2013-06-10T11:45:22.847 回答