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Android 干货分享

阅读五分钟，每日十点，和您一起终身学习，这里是程序员Android

本篇文章主要介绍 Android 开发中的部分知识点，通过阅读本篇文章，您将收获以下内容:

1. 自定义View类实现
2. 自定义View 布局
3. 自定义View 素材
4. Activity使用自定义View

自定义ItemToggleView 常用于Settings中，主要控制开关的开启与关闭。

自定义ItemToggleView实现效果如下：

1. 自定义View类实现

public class SwitchControlView extends View implements OnTouchListener {
private Bitmap bg_on, bg_off, slipper_btn;
private float downX, nowX;private boolean onSlip = false;private boolean nowStatus = false;private OnChangedListener listener;public SwitchControlView(Context context) {
super(context);
init();
}public SwitchControlView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}public void init() {
bg_on = BitmapFactory.decodeResource(getResources(), R.drawable.on_btn);
bg_off = BitmapFactory.decodeResource(getResources(),
R.drawable.off_btn);
slipper_btn = BitmapFactory.decodeResource(getResources(),
R.drawable.white_btn);
setOnTouchListener(this);
}protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Matrix matrix = new Matrix();
Paint paint = new Paint();
float x = 0;
if (bg_on != null && bg_off != null) {
if (nowX < (bg_on.getWidth() / 2)) {
canvas.drawBitmap(bg_off, matrix, paint);
} else {
canvas.drawBitmap(bg_on, matrix, paint);
}
}if (onSlip) {
if (nowX >= bg_on.getWidth())
x = bg_on.getWidth() - slipper_btn.getWidth() / 2;
else
x = nowX - slipper_btn.getWidth() / 2;
} else {
if (nowStatus) {
x = bg_on.getWidth() - slipper_btn.getWidth();
} else {
x = 0;
}
}if (x < 0) {
x = 0;
} else if (x > bg_on.getWidth() - slipper_btn.getWidth()) {
x = bg_on.getWidth() - slipper_btn.getWidth();
}canvas.drawBitmap(slipper_btn, x, 0, paint);
}@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
if (event.getX() > bg_off.getWidth()
|| event.getY() > bg_off.getHeight()) {
return false;
} else {
onSlip = true;
downX = event.getX();
nowX = downX;
}
break;
}
case MotionEvent.ACTION_MOVE: {
nowX = event.getX();
break;
}
case MotionEvent.ACTION_UP: {
onSlip = false;
if (event.getX() >= (bg_on.getWidth() / 2)) {
nowStatus = true;
nowX = bg_on.getWidth() - slipper_btn.getWidth();
} else {
nowStatus = false;
nowX = 0;
}if (listener != null) {
listener.OnChanged(SwitchControlView.this, nowStatus);
}
break;
}
}
invalidate();
return true;
}public void setOnChangedListener(OnChangedListener listener) {
this.listener = listener;
}public void setChecked(boolean checked) {
if (checked) {
nowX = bg_off.getWidth();
} else {
nowX = 0;
}
nowStatus = checked;
}public interface OnChangedListener {
public void OnChanged(SwitchControlView wiperSwitch, boolean checkState);
}}

2.自定义View 布局

    <com.programandroid.CustomView.SwitchControlView
        android:id="@+id/switch_control_view"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:layout_gravity="center_vertical" />

3. 自定义View 素材

4. Activity使用自定义View

/**
 * InitSwitchView 自定义滑动开关实现
 */
private void InitSwitchView() {
// TODO Auto-generated method stub
SwitchControlView wiperSwitch = (SwitchControlView) findViewById(R.id.switch_control_view);
wiperSwitch.setChecked(true);
wiperSwitch.setOnChangedListener(new OnChangedListener() {@Override
public void OnChanged(SwitchControlView wiperSwitch,
boolean checkState) {
// TODO Auto-generated method stubif (checkState) {
Toast.makeText(CustomViewMethods.this, "开启", 1).show();} else {
Toast.makeText(CustomViewMethods.this, "关闭", 1).show();
}
}
});
}

至此，本篇已结束，如有不对的地方，欢迎您的建议与指正。同时期待您的关注，感谢您的阅读，谢谢！