Android 自定义View——自定义ProgressBar
Android中给我们提供了多个样式的ProgressBar，SeekBar，RatingBaar等进度条，但是我们这些样式都满足不了我们的要求，这时我们就可以使用自定义View来定义我们自己想要的形式的进度条。
这里讲解三种样式的进度条，由于博主还米有学习过动画，所以这里不添加动画效果。想要学习自定义控件的可以先参考这篇文章>《Android 自定义View——自定义View控件 》。
形式一
效果：
控件的定义
1. 定义一个MyProgressCircle的类继承View类。
2. 定义一个MyProgressCircle(Context context, AttributeSet attrs)的构造器。
3. 重写其onMesure和onDraw方法。
4. 在onDraw方法中绘制进度条。
以上是自定义控件的基本步骤，我们先看代码，然后逐步讲解：
public class MyProgressCircle extends View {
private int width;//设置高
private int height;//设置高
//设置画笔
private Paint mPaintBackground;
private Paint mPaintCurrent;
private Paint mPaintText;
//设置进度
private int maxProgress=100;
private int currentProgress=0;
public int getMaxProgress() {
return maxProgress;
}
public void setMaxProgress(int maxProgress) {
this.maxProgress = maxProgress;
}
public int getCurrentProgress() {
return currentProgress;
}
public void setCurrentProgress(int currentProgress) {
this.currentProgress = currentProgress;
invalidate();//实时更新进度
}
public MyProgressCircle(Context context, AttributeSet attrs) {
super(context, attrs);
//绘制未下载时背景圆的画笔
mPaintBackground = new Paint();
mPaintBackground.setAntiAlias(true);
mPaintBackground.setColor(Color.LTGRAY);
//绘制下载时显示进度圆的画笔
mPaintCurrent = new Paint();
mPaintCurrent.setAntiAlias(true);
mPaintCurrent.setColor(Color.GRAY);
//绘制显示下载进度文字的画笔
mPaintText = new Paint();
mPaintText.setAntiAlias(true);
mPaintText.setColor(Color.BLACK);
mPaintText.setTextAlign(Paint.Align.CENTER);
mPaintText.setTextSize(100);
}
public MyProgressCircle(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);//设置宽和高
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawCircle(width / 2, height / 2, 300, mPaintBackground);
canvas.drawCircle(width/2, height/2, currentProgress*300f/maxProgress, mPaintCurrent);
canvas.drawText(currentProgress*100f/maxProgress+"%", width/2, height/2, mPaintText);
}
}这里就只是绘制了两个圆形，但是这两个圆形是有联系的。背景圆代表的进度的最大值，当前圆是代表的是当前的进度。当当前进度改变时，当前圆也是要变化的，我们从刚才的效果中可以看到当前圆变化的是半径，所以我们在绘制时，将其半径设置为：currentProgress*300f/maxProgress。这个应该是比较好理解的。
控件的使用
然后我们在Activity中使用一下，模拟下载。
1. 在布局中定义添加控件。
<LinearLayout 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:orientation="vertical" tools:context=".MainActivity">
<Button android:id="@+id/button_start" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始进度"/>
<com.example.administrator.mywidgetdemo.widget.MyProgressCircle android:id="@+id/myprogress" android:layout_width="match_parent" android:layout_height="match_parent" />
</LinearLayout>- 在Activity使用通过点击按钮开始下载。
public class MainActivity extends Activity {
private MyProgressCircle myProgressCircle;
private Button mButtonStart;
private static final int PROGRESS_ONE = 0X0001;
//定义一个进度
private int progress;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case PROGRESS_ONE:
progress++;
if(progress<=100){
myProgressCircle.setCurrentProgress(progress);
sendEmptyMessageDelayed(PROGRESS_ONE, 100);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButtonStart = (Button) findViewById(R.id.button_start);
//获取控件的对象
myProgressCircle = (MyProgressCircle) findViewById(R.id.myprogress);
mButtonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handler.sendEmptyMessageDelayed(PROGRESS_ONE, 1000);
}
});
}
}形式二
效果：
控件的定义
1. 定义一个MyProgressCircle的类继承View类。
2. 定义一个MyProgressCircle(Context context, AttributeSet attrs)的构造器。
3. 重写其onMesure和onDraw方法。
4. 在onDraw方法中绘制进度条。
以上是自定义控件的基本步骤，我们先看代码，然后逐步讲解：
public class MyProgressArc extends View {
private int width;//设置高
private int height;//设置高
//设置画笔
private Paint mPaintBackground;
private Paint mPaintCurrent;
private Paint mPaintText;
//设置进度
private int maxProgress=100;
private int currentProgress=0;
public int getMaxProgress() {
return maxProgress;
}
public void setMaxProgress(int maxProgress) {
this.maxProgress = maxProgress;
}
public int getCurrentProgress() {
return currentProgress;
}
public void setCurrentProgress(int currentProgress) {
this.currentProgress = currentProgress;
invalidate();//实时更新进度
}
public MyProgressArc(Context context) {
super(context);
}
public MyProgressArc(Context context, AttributeSet attrs) {
super(context, attrs);
mPaintBackground = new Paint();
mPaintBackground.setAntiAlias(true);
mPaintBackground.setStyle(Paint.Style.STROKE);
mPaintBackground.setColor(Color.LTGRAY);
mPaintBackground.setStrokeWidth(60);
mPaintCurrent = new Paint();
mPaintCurrent.setAntiAlias(true);
mPaintCurrent.setStyle(Paint.Style.STROKE);
mPaintCurrent.setColor(Color.GRAY);
mPaintCurrent.setStrokeWidth(60);
mPaintText = new Paint();
mPaintText.setAntiAlias(true);
mPaintText.setColor(Color.BLACK);
mPaintText.setTextAlign(Paint.Align.CENTER);
mPaintText.setTextSize(100);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);//设置宽和高
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rect = new RectF(width/2-300, height/2-300, width/2+300, height/2+300);
canvas.drawArc(rect,currentProgress*360f/maxProgress,360f-currentProgress*360f/maxProgress, false, mPaintBackground);
canvas.drawArc(rect, 0,currentProgress*360f/maxProgress, false, mPaintCurrent);
canvas.drawText(currentProgress*100f/maxProgress+"%", width/2, height/2, mPaintText);
}
}这里就只是绘制了两个椭圆，但是这两个椭圆是有联系的。背景椭圆代表的进度的最大值，当前椭圆是代表的是当前的进度。当当前进度改变时，当前椭圆也是要变化的，我们从刚才的效果中可以看到椭圆变化的是旋转的角度。背景椭圆的角度在不断的减小，减小的数量是currentProgress*360f/maxProgress，基数是360度，当前椭圆角度在不断增大，增大的角度是currentProgress*360f/maxProgress，基数是0度。
控件的使用
然后我们在Activity中使用一下，模拟下载。
1. 在布局中定义添加控件。
<LinearLayout 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:orientation="vertical" tools:context=".MainActivity">
<Button android:id="@+id/button_start" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始进度"/>
<com.example.administrator.mywidgetdemo.widget.MyProgressArc android:id="@+id/myprogress" android:layout_width="match_parent" android:layout_height="match_parent" />
</LinearLayout>- 在Activity使用通过点击按钮开始下载。
public class MainActivity extends Activity {
private MyProgressArc myProgressArc;
private Button mButtonStart;
private static final int PROGRESS_TWO = 0X0002;
//定义一个进度
private int progress;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case PROGRESS_TWO:
progress++;
if(progress<=100){
myProgressArc.setCurrentProgress(progress);
sendEmptyMessageDelayed(PROGRESS_TWO, 100);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButtonStart = (Button) findViewById(R.id.button_start);
myProgressArc = (MyProgressArc) findViewById(R.id.myprogress);
mButtonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handler.sendEmptyMessageDelayed(PROGRESS_TWO, 1000);
}
});
}
}形式三
效果：
控件的定义
1. 定义一个MyProgressCircle的类继承View类。
2. 定义一个MyProgressCircle(Context context, AttributeSet attrs)的构造器。
3. 重写其onMesure和onDraw方法。
4. 在onDraw方法中绘制进度条。
以上是自定义控件的基本步骤，我们先看代码，然后逐步讲解：
public class MyProgressRect extends View {
private int width;//设置高
private int height;//设置高
//设置画笔
private Paint mPaintBackground;
private Paint mPaintCurrent;
private Paint mPaintText;
//设置进度
private int maxProgress = 100;
private int currentProgress = 0;
private float currentProgressHeight;
public int getMaxProgress() {
return maxProgress;
}
public void setMaxProgress(int maxProgress) {
this.maxProgress = maxProgress;
}
public int getCurrentProgress() {
return currentProgress;
}
public void setCurrentProgress(int currentProgress) {
this.currentProgress = currentProgress;
invalidate();//实时更新进度
}
public MyProgressRect(Context context) {
super(context);
}
public MyProgressRect(Context context, AttributeSet attrs) {
super(context, attrs);
mPaintBackground = new Paint();
mPaintBackground.setAntiAlias(true);
mPaintBackground.setStyle(Paint.Style.FILL);
mPaintBackground.setColor(Color.LTGRAY);
mPaintBackground.setStrokeWidth(60);
mPaintCurrent = new Paint();
mPaintCurrent.setAntiAlias(true);
mPaintCurrent.setStyle(Paint.Style.FILL);
mPaintCurrent.setColor(Color.GRAY);
mPaintCurrent.setStrokeWidth(60);
mPaintText = new Paint();
mPaintText.setAntiAlias(true);
mPaintText.setColor(Color.BLACK);
mPaintText.setTextAlign(Paint.Align.CENTER);
mPaintText.setTextSize(100);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);//设置宽和高
}
@Override
protected void onDraw(Canvas canvas) {
//定义水柱的高度。
currentProgressHeight = currentProgress*600f/ maxProgress;
super.onDraw(canvas);
canvas.drawRect(width / 2 - 300, height / 2 - 300, width / 2 + 300,(height / 2 + 300) - (currentProgressHeight), mPaintBackground);
canvas.drawRect(width / 2 - 300, (height / 2 + 300) - (currentProgressHeight), width / 2 + 300, height / 2 + 300, mPaintCurrent);
canvas.drawText(currentProgress * 100f / maxProgress + "%", width / 2, height / 2, mPaintText);
}
}这里就只是绘制了两个矩形，但是这两个矩形是有联系的。背景矩形代表的进度的最大值，当前矩形是代表的是当前的进度。当当前进度改变时，当前矩形和背景矩形也要变化的，我们从刚才的效果中可以看到变化的是高度。背景矩形的高度在不断的减小，当前矩形的高度在不断地增大，变化数都是currentProgressHeight，值为currentProgress*600f/ maxProgress。
控件的使用
然后我们在Activity中使用一下，模拟下载。
1. 在布局中定义添加控件。
<LinearLayout 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:orientation="vertical" tools:context=".MainActivity">
<Button android:id="@+id/button_start" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始进度"/>
<com.example.administrator.mywidgetdemo.widget.MyProgressRect android:id="@+id/myprogress" android:layout_width="match_parent" android:layout_height="match_parent" />
</LinearLayout>- 在Activity使用通过点击按钮开始下载。
public class MainActivity extends Activity {
private MyProgressRect myProgressRect;
private Button mButtonStart;
private static final int PROGRESS_RECT = 0X0003;
//定义一个进度
private int progress;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case PROGRESS_RECT:
progress++;
if (progress <= 100) {
myProgressRect.setCurrentProgress(progress);
sendEmptyMessageDelayed(PROGRESS_RECT, 100);
}
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButtonStart = (Button) findViewById(R.id.button_start);
myProgressRect = (MyProgressRect) findViewById(R.id.myprogress);
mButtonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handler.sendEmptyMessageDelayed(PROGRESS_RECT, 1000);
}
});
}
}