[Android] Android 锁屏实现与总结 （三）
上接：
系列文章链接如下：
代码文件地址：
https://github.com/wukong1688/Android-BaseLockScreen
3、按键的屏蔽
当自定义锁屏页最终出现在手机上时，我们希望它像系统锁屏页那样屹立不倒，所有的按键都不能触动它，只有通过划屏或者指纹才能解锁，因此有必要对按键进行一定程度上的屏蔽。针对只有虚拟按键的手机，我们可以通过隐藏虚拟按键的方式部分解决这个问题。但是当用户在锁屏页底部滑动，隐藏后的虚拟按键还是会滑出，而且如果用户是物理按键的话就必须进行屏蔽了。需要重写Activity的onBackPressed()方法即可。
public boolean onKeyDown(int keyCode, KeyEvent event) {
int key = event.getKeyCode();
switch (key) {
case KeyEvent.KEYCODE_BACK: {
return true;
}
case KeyEvent.KEYCODE_MENU: {
return true;
}
}
return super.onKeyDown(keyCode, event);
}
Home键 与Recent键的点击事件是在framework层进行处理的，因此onKeyDown()与dispatchKeyEvent()都捕获不到点击事件。关于这两个按键的屏蔽方法，网上相关的资料有很多，有的用到了反射，有的通过改变Window的标志位和Type等，总的来说这些方法只对部分android版本有效，有的则完全无法编译通过。其实这么做的目的无非是为了实现一个纯粹的锁屏页，但是这种做法容易造成锁屏页的异常崩溃，我们要满足的是用户在锁屏页的快捷操作，Home键和Recent键无关痛痒，基本可以不管。
4、滑屏解锁
做完以上几步，当屏幕熄灭后，再打开屏幕就能够看到我们的自定义锁屏页了。接下来要实现划屏解锁。
实现滑屏解锁的类LockScreenView.java：
package com.jack.applockscreen.activity; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Align; import android.graphics.Paint.Style; import android.graphics.Point; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.support.v4.view.ViewConfigurationCompat; import android.text.TextPaint; import android.util.AttributeSet; import android.view.Display; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.WindowManager; import com.jack.applockscreen.R; /** * 解锁按钮控件 * * @author chenglei */ public class LockScreenView extends View { private int mWidth; private int mHeight; private int mScreenWidth; private int mScreenHeight; private WindowManager mWindowManager; private Display mDisplay; private float mTouchPadRadius; private float mTouchPadBorderWidthNormal; private float mTouchPadBorderWidthPressed; private Paint mPaintNormal; private TextPaint mTextPaint; private Paint mBackgroundPaint; private Point mTouchPadCenter = new Point(); private int mTouchSlop; private int mStartX; private int mCurrX; private int mOffectX; private boolean mCanMove; private Drawable mDrawableLeft; private Drawable mDrawableRight; private Drawable mDrawableCenter; private String mTextLeft; private String mTextRight; private Point mTargetDrawableLeftPosition = new Point(); private Point mTargetDrawableRightPosition = new Point(); private Point mTargetTextLeftPosition = new Point(); private Point mTargetTextRightPosition = new Point(); private float mDensity; private static final float TOUCH_PAD_BORDER_WIDTH_NORMAL = 3; private static final float TOUCH_PAD_BORDER_WIDTH_PRESSED = 3; private static final float TARGET_DRAWABLE_PADDING = 32; private static final float TARGET_TEXT_SIZE = 16; private static final int STATE_TRIGGER_NONE = 0; private static final int STATE_TRIGGER_LEFT = 1; private static final int STATE_TRIGGER_RIGHT = 2; private int mTouchPadTriggerState = STATE_TRIGGER_NONE; private OnTriggerListener mOnTriggerListener; private Drawable mDotsLeft; private Drawable mDotsRight; public LockScreenView(Context context) { this(context, null, 0); } public LockScreenView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public LockScreenView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void init() { mWindowManager = ((Activity) getContext()).getWindowManager(); mDisplay = mWindowManager.getDefaultDisplay(); mScreenWidth = mDisplay.getWidth(); mScreenHeight = mDisplay.getHeight(); // mTouchPadBorderWidthNormal = DensityUtil.dip2px(getContext(), 8); // mTouchPadBorderWidthPressed = DensityUtil.dip2px(getContext(), 2); mDensity = getResources().getDisplayMetrics().density; mTouchPadBorderWidthNormal = TOUCH_PAD_BORDER_WIDTH_NORMAL * mDensity; mTouchPadBorderWidthPressed = TOUCH_PAD_BORDER_WIDTH_PRESSED * mDensity; final ViewConfiguration configuration = ViewConfiguration.get(getContext()); mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration); mDrawableCenter = getResources().getDrawable(R.mipmap.ic_launcher); mDotsLeft = getResources().getDrawable(R.mipmap.keyguaid_dots_left); mDotsRight = getResources().getDrawable(R.mipmap.keyguaid_dots_right); initNormalPaint(); initTextPaint(); } private void initNormalPaint() { mPaintNormal = new Paint(); mPaintNormal.setFlags(Paint.ANTI_ALIAS_FLAG); mPaintNormal.setColor(Color.WHITE); mPaintNormal.setStyle(Style.STROKE); mPaintNormal.setStrokeWidth(mTouchPadBorderWidthNormal); mBackgroundPaint = new Paint(); mBackgroundPaint.setColor(Color.parseColor("#66000000")); } private void initTextPaint() { mTextPaint = new TextPaint(TextPaint.ANTI_ALIAS_FLAG); mTextPaint.setColor(Color.WHITE); mTextPaint.setTextAlign(Align.CENTER); mTextPaint.setTextSize(TARGET_TEXT_SIZE * mDensity); } @Override protected void onDraw(Canvas canvas) { drawBackground(canvas); drawDots(canvas); drawTouchPad(canvas); drawTargetDrawablesAndTexts(canvas); } private void drawBackground(Canvas canvas) { canvas.drawRect(0, mHeight / 4, mWidth, mHeight * 3 / 4, mBackgroundPaint); } private void drawDots(Canvas canvas) { if (!mTouchDown) { BitmapDrawable dotsLeft = (BitmapDrawable) mDotsLeft; BitmapDrawable dotsRight = (BitmapDrawable) mDotsRight; canvas.drawBitmap(dotsLeft.getBitmap(), mWidth / 4 - mDotsLeft.getIntrinsicWidth() / 2, mHeight / 2 - mDotsLeft.getIntrinsicHeight() / 2, mPaintNormal); canvas.drawBitmap(dotsRight.getBitmap(), mWidth * 3 / 4 - mDotsRight.getIntrinsicWidth() / 2, mHeight / 2 - mDotsRight.getIntrinsicHeight() / 2, mPaintNormal); } } private void drawTouchPad(Canvas canvas) { BitmapDrawable bd = (BitmapDrawable) mDrawableCenter; if (mTouchDown) { canvas.drawCircle(mTouchPadCenter.x, mTouchPadCenter.y, mDrawableCenter.getIntrinsicWidth() - 20, mPaintNormal); } else { canvas.drawBitmap(bd.getBitmap(), mTouchPadCenter.x - mDrawableCenter.getIntrinsicWidth() / 2, mTouchPadCenter.y - mDrawableCenter.getIntrinsicHeight() / 2, mPaintNormal); canvas.drawCircle(mTouchPadCenter.x, mTouchPadCenter.y, mDrawableCenter.getIntrinsicWidth() - 20, mPaintNormal); } } private void drawTargetDrawablesAndTexts(Canvas canvas) { if (mDrawableLeft != null) { BitmapDrawable bd = (BitmapDrawable) mDrawableLeft; canvas.drawBitmap( bd.getBitmap(), mTargetDrawableLeftPosition.x - mDrawableLeft.getIntrinsicWidth() / 2, mTargetDrawableLeftPosition.y - mDrawableLeft.getIntrinsicHeight() / 2, mPaintNormal); } if (mDrawableRight != null) { BitmapDrawable bd = (BitmapDrawable) mDrawableRight; canvas.drawBitmap( bd.getBitmap(), mTargetDrawableRightPosition.x - mDrawableRight.getIntrinsicWidth() / 2, mTargetDrawableRightPosition.y - mDrawableRight.getIntrinsicHeight() / 2, mPaintNormal); } if (mTextLeft != null) { canvas.drawText(mTextLeft, mTargetTextLeftPosition.x, mTargetTextLeftPosition.y, mTextPaint); } if (mTextRight != null) { canvas.drawText(mTextRight, mTargetTextRightPosition.x, mTargetTextRightPosition.y, mTextPaint); } } @Override public boolean performClick() { return super.performClick(); } private boolean mTouchDown = false; @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mStartX = (int) event.getX(); if (mStartX > mTouchPadCenter.x - mTouchPadRadius && mStartX < mTouchPadCenter.x + mTouchPadRadius) { mPaintNormal.setStrokeWidth(mTouchPadBorderWidthPressed); mTouchDown = true; invalidate(); } else { return false; } break; case MotionEvent.ACTION_MOVE: mCurrX = (int) event.getX(); // mOffectX = mCurrX - mStartX; // // if (!mCanMove && Math.abs(mOffectX) < mTouchSlop) { // return false; // } else { // mCanMove = true; // if (mOffectX > mTouchSlop) { // mOffectX += mTouchSlop; // } else if (mOffectX < -mTouchSlop) { // mOffectX -= mTouchSlop; // } // } mStartX = mCurrX; if (mDrawableRight != null && mCurrX < mWidth * 5 / 12 /*mTargetDrawableLeftPosition.x + mDrawableRight.getIntrinsicWidth() * 2.5*/) { mTouchPadCenter.set(mTargetDrawableLeftPosition.x, mTargetDrawableLeftPosition.y); mTouchPadTriggerState = STATE_TRIGGER_LEFT; } else if (mDrawableRight != null && mCurrX > mWidth * 7 / 12 /*mTargetDrawableRightPosition.x - mDrawableRight.getIntrinsicWidth() * 2.5*/) { mTouchPadCenter.set(mTargetDrawableRightPosition.x, mTargetDrawableRightPosition.y); mTouchPadTriggerState = STATE_TRIGGER_RIGHT; } else { mTouchPadCenter.x = mCurrX; mTouchPadCenter.set(mTouchPadCenter.x + mOffectX, mTouchPadCenter.y); mTouchPadTriggerState = STATE_TRIGGER_NONE; } invalidate(); break; case MotionEvent.ACTION_UP: mCanMove = false; if (STATE_TRIGGER_NONE == mTouchPadTriggerState) { mTouchPadCenter.set(mWidth / 2, mHeight / 2); //mPaintNormal.setStrokeWidth(mTouchPadBorderWidthNormal); mTouchDown = false; invalidate(); } else if (STATE_TRIGGER_LEFT == mTouchPadTriggerState) { if (mOnTriggerListener != null) { mOnTriggerListener.onTriggerLeft(); } } else if (STATE_TRIGGER_RIGHT == mTouchPadTriggerState) { if (mOnTriggerListener != null) { mOnTriggerListener.onTriggerRight(); } } break; } return true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); if (widthMode == MeasureSpec.EXACTLY) { // Parent has told us how big to be. So be it. mWidth = widthSize; } else { mWidth = mScreenWidth; // Check against our minimum width mWidth = Math.max(mWidth, getSuggestedMinimumWidth()); if (widthMode == MeasureSpec.AT_MOST) { mWidth = Math.min(widthSize, mWidth); } } if (heightMode == MeasureSpec.EXACTLY) { mHeight = heightSize; } else { mHeight = mScreenHeight / 4; // Check against our minimum width mHeight = Math.max(mHeight, getSuggestedMinimumHeight()); if (heightMode == MeasureSpec.AT_MOST) { mHeight = Math.min(heightSize, mHeight); } } setMeasuredDimension(mWidth, mHeight); mTouchPadRadius = mDrawableCenter.getIntrinsicWidth(); mTouchPadCenter.set(mWidth / 2, mHeight / 2); mTargetDrawableLeftPosition.set((int) (TARGET_DRAWABLE_PADDING * mDensity), mHeight / 2); mTargetDrawableRightPosition.set((int) (mWidth - TARGET_DRAWABLE_PADDING * mDensity), mHeight / 2); mTargetTextLeftPosition.set((int) (TARGET_DRAWABLE_PADDING * mDensity), (int) (mHeight / 2 - 20 * mDensity)); mTargetTextRightPosition.set((int) (mWidth - TARGET_DRAWABLE_PADDING * mDensity), (int) (mHeight / 2 - 20 * mDensity)); } public void setTargetDrawablesAndTexts(Drawable drawableLeft, Drawable drawableRight, String textLeft, String textRight) { mDrawableLeft = drawableLeft; mDrawableRight = drawableRight; mTextLeft = textLeft; mTextRight = textRight; invalidate(); } public void setTargetDrawablesAndTexts(int drawableLeftId, int drawableRightId, String textLeft, String textRight) { mDrawableLeft = drawableLeftId > 0 ? getResources().getDrawable(drawableLeftId) : null; mDrawableRight = drawableRightId > 0 ? getResources().getDrawable(drawableRightId) : null; mTextLeft = textLeft; mTextRight = textRight; invalidate(); } public interface OnTriggerListener { public void onTriggerLeft(); public void onTriggerRight(); } public void setOnTriggerListener(OnTriggerListener l) { mOnTriggerListener = l; } }
很多朋友私下问我代码文件的位置，这里也贴出来分享给大家！
Github地址：
https://github.com/wukong1688/Android_BaseLockScreen
