昨天朋友項目中有個需求讓我幫忙看看怎么搞，就跟去哪兒攜程買機票時點中間按鈕互換出發地和目的地的效果，當時一看覺得挺簡單，用補間動畫，在動畫完成時設置給兩邊各textview互換值就好，做出來后發現效果不好，在最后互換值得時候會有閃爍，于是就用了一種較為麻煩的方法，不過效果是達到了，記錄一下。gif效果不好。

內容

簡單說下思路,在點擊互換按鈕后:

1、計算互換位置的需要的偏移量:

這里需要需要考慮的特殊地方就是左右兩邊有可能文字長度不一樣,所以我在textview外面套了一層相對布局.畫個圖來說明吧.布局最外層是個水平的線性布局,中間一個button,兩邊各一個相對布局寬度0dp權重1,里面的textview寬度都是包裹內容的.

2、獲取兩側textview的坐標及繪圖緩存,創建鏡像view,隱藏兩側的textview,這里直接看下面代碼就好啦,需要注意的是Y坐標要減去狀態欄高度.

3、隱藏兩側的textview,開啟鏡像view的屬性動畫,在結束時互換textview的值,顯示出textview,移除鏡像view,釋放資源.

代碼

public class AddressActivity extends AppCompatActivity {

private TextView mTvLeft;

private TextView mTvRight;

private Button mBtn;

private RelativeLayout mRlLeft;

private RelativeLayout mRlRight;

private WindowManager mWindowManager;

private int[] mLeftLocation;

private int[] mRightLocation;

private Bitmap mLeftCacheBitmap;

private Bitmap mRightCacheBitmap;

private LinearLayout mLl;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_address);

mWindowManager = getWindowManager();

mTvLeft = (TextView) findViewById(R.id.tv_left);

mTvRight = (TextView) findViewById(R.id.tv_right);

mRlLeft = (RelativeLayout) findViewById(R.id.rl_left);

mRlRight = (RelativeLayout) findViewById(R.id.rl_right);

mLl = (LinearLayout) findViewById(R.id.ll);

mBtn = (Button) findViewById(R.id.btn);

mBtn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

textAnim();

mBtn.setEnabled(false);

}

});

}

/**

* 左邊tv的鏡像view

*/

private ImageView copyViewLeft;

/**

* 右邊tv的鏡像view

*/

private ImageView copyViewRight;

/**

* 獲取tv的屬性,計算偏移量,

*/

private void textAnim() {

//獲取tv控件距離父控件的位置

int leftRight = mTvLeft.getRight();

int rightLeft = mTvRight.getLeft();

//包裹右側tv距離父控件的距離

int rlRight = mRlRight.getRight();

int rlLeft = mRlRight.getLeft();

//在哪里設的padding就要用哪個控件來獲取padding值

int paddingStart = mLl.getPaddingStart();

Log.d("AddressActivity", "paddingStart:" + paddingStart);

//左側textview需要移動的距離

int leftOffset = rlRight - leftRight - paddingStart;

//右側textview需要移動的距離

int rightOffset = rlLeft + rightLeft - paddingStart;

//創建出鏡像view

createCopyView();

//隱藏掉兩邊的tv

mTvLeft.setVisibility(View.INVISIBLE);

mTvRight.setVisibility(View.INVISIBLE);

//開啟鏡像view的動畫

leftAnim(leftOffset,mLeftLocation[0]);

rightAnim(rightOffset,mRightLocation[0]);

}

/**

* 創建鏡像view

*/

private void createCopyView(){

mLeftLocation = new int[2];

mRightLocation = new int[2];

//獲取相對window的坐標

mTvLeft.getLocationInWindow(mLeftLocation);

mTvRight.getLocationInWindow(mRightLocation);

//獲取左邊tv的緩存bitmap

mTvLeft.setDrawingCacheEnabled(true);

mLeftCacheBitmap = Bitmap.createBitmap(mTvLeft.getDrawingCache());

mTvLeft.destroyDrawingCache();

//獲取右邊tv的緩存bitmap

mTvRight.setDrawingCacheEnabled(true);

mRightCacheBitmap = Bitmap.createBitmap(mTvRight.getDrawingCache());

mTvRight.destroyDrawingCache();

//創建出兩個鏡像view

copyViewLeft = createCopyView(mLeftLocation[0], mLeftLocation[1], mLeftCacheBitmap);

copyViewRight = createCopyView(mRightLocation[0], mRightLocation[1], mRightCacheBitmap);

//釋放bitmap資源...這我不確定是不是這么做

mLeftCacheBitmap = null;

mRightCacheBitmap = null;

}

/**

* 左側鏡像view的動畫

* @param offset 偏移量

* @param defX 原始位置的x

*/

private void leftAnim(int offset, final int defX){

ValueAnimator leftAnimV = ValueAnimator.ofInt(0,offset);

leftAnimV.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator valueAnimator) {

int animatedValue = (int) valueAnimator.getAnimatedValue();

WindowManager.LayoutParams layoutParams = (WindowManager.LayoutParams) copyViewLeft.getLayoutParams();

//往右邊移動所以x是變大的

layoutParams.x = defX + animatedValue;

mWindowManager.updateViewLayout(copyViewLeft,layoutParams);

}

});

leftAnimV.setDuration(400);

leftAnimV.start();

//左側動畫監聽

leftAnimV.addListener(new AnimatorListenerAdapter() {

@Override

public void onAnimationEnd(Animator animation) {

//改變值

String s = mTvLeft.getText().toString();

mTvLeft.setText(mTvRight.getText().toString());

mTvRight.setText(s);

mTvLeft.setVisibility(View.VISIBLE);

mWindowManager.removeView(copyViewLeft);

copyViewLeft = null;

mBtn.setEnabled(true);

}

});

}

/**

* 右側鏡像view動畫

* @param offset 偏移量

* @param defX 原始位置的x

*/

private void rightAnim(int offset, final int defX){

ValueAnimator rightAnimV = ValueAnimator.ofInt(0,offset);

rightAnimV.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator valueAnimator) {

int animatedValue = (int) valueAnimator.getAnimatedValue();

WindowManager.LayoutParams layoutParams = (WindowManager.LayoutParams) copyViewRight.getLayoutParams();

layoutParams.x = defX - animatedValue;

mWindowManager.updateViewLayout(copyViewRight,layoutParams);

}

});

rightAnimV.setDuration(400);

rightAnimV.start();

rightAnimV.addListener(new AnimatorListenerAdapter() {

@Override

public void onAnimationEnd(Animator animation) {

mTvRight.setVisibility(View.VISIBLE);

mWindowManager.removeView(copyViewRight);

copyViewRight = null;

}

});

}

/**

* 創建鏡像view

*

* @param x

* @param y

* @param bitmap

*/

private ImageView createCopyView(int x, int y, Bitmap bitmap) {

WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams();

mLayoutParams.format = PixelFormat.TRANSLUCENT; //圖片之外其他地方透明

mLayoutParams.gravity = Gravity.TOP | Gravity.LEFT;

mLayoutParams.x = x; //設置imageView的原點

mLayoutParams.y = y - getStatusHeight(this);

mLayoutParams.alpha = 1f; //設置透明度

mLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;

mLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE

| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;

ImageView copyView = new ImageView(this);

copyView = new ImageView(this);

copyView.setImageBitmap(bitmap);

mWindowManager.addView(copyView, mLayoutParams); //添加該iamgeView到window

return copyView;

}

/**

* 獲取狀態欄的高度

* @param context

* @return

*/

private static int getStatusHeight(Context context) {

int statusHeight = 0;

Rect localRect = new Rect();

((Activity) context).getWindow().getDecorView().getWindowVisibleDisplayFrame(localRect);

statusHeight = localRect.top;

if (0 == statusHeight) {

Class> localClass;

try {

localClass = Class.forName("com.android.internal.R$dimen");

Object localObject = localClass.newInstance();

int i5 = Integer.parseInt(localClass.getField("status_bar_height").get(localObject).toString());

statusHeight = context.getResources().getDimensionPixelSize(i5);

} catch (Exception e) {

e.printStackTrace();

}

}

return statusHeight;

}

}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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