仿微信滑动返回
核心代码：
import java.io.File; import java.io.FileOutputStream; import java.lang.reflect.Field; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Rect; import android.os.Bundle; import android.support.v4.widget.SlidingPaneLayout; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; /** * @Title: ${file_name} * @Description: 带视觉差的滑动返回 */ public class ParallaxSwipeBackActivity extends Activity implements SlidingPaneLayout.PanelSlideListener { private final static String TAG = ParallaxSwipeBackActivity.class.getSimpleName(); private final static String WINDOWBITMAP = "screenshots.jpg"; private File mFileTemp; private SlidingPaneLayout slidingPaneLayout; private FrameLayout frameLayout; private ImageView behindImageView; private ImageView shadowImageView; private int defaultTranslationX = 100; private int shadowWidth = 20; @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { //通过反射来改变SlidingPanelayout的值 try { slidingPaneLayout = new SlidingPaneLayout(this); Field f_overHang = SlidingPaneLayout.class.getDeclaredField("mOverhangSize"); f_overHang.setAccessible(true); f_overHang.set(slidingPaneLayout, 0); slidingPaneLayout.setPanelSlideListener(this); slidingPaneLayout.setSliderFadeColor(getResources().getColor(android.R.color.transparent)); } catch (Exception e) { e.printStackTrace(); } super.onCreate(savedInstanceState); mFileTemp = new File(getCacheDir(), WINDOWBITMAP); defaultTranslationX = dip2px(defaultTranslationX); shadowWidth = dip2px(shadowWidth); //behindframeLayout FrameLayout behindframeLayout = new FrameLayout(this); behindImageView = new ImageView(this); behindImageView.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT)); behindframeLayout.addView(behindImageView, 0); //containerLayout LinearLayout containerLayout = new LinearLayout(this); containerLayout.setOrientation(LinearLayout.HORIZONTAL); containerLayout.setBackgroundColor(getResources().getColor(android.R.color.transparent)); containerLayout.setLayoutParams(new ViewGroup.LayoutParams(getWindowManager().getDefaultDisplay().getWidth() + shadowWidth, ViewGroup.LayoutParams.MATCH_PARENT)); //you view container frameLayout = new FrameLayout(this); frameLayout.setBackgroundColor(getResources().getColor(android.R.color.white)); frameLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT)); //add shadow shadowImageView = new ImageView(this); shadowImageView.setBackgroundResource(R.drawable.shadow); shadowImageView.setLayoutParams(new LinearLayout.LayoutParams(shadowWidth, LinearLayout.LayoutParams.MATCH_PARENT)); containerLayout.addView(shadowImageView); containerLayout.addView(frameLayout); containerLayout.setTranslationX(-shadowWidth); //添加两个view slidingPaneLayout.addView(behindframeLayout, 0); slidingPaneLayout.addView(containerLayout, 1); } @Override public void setContentView(int id) { setContentView(getLayoutInflater().inflate(id, null)); } @Override public void setContentView(View v) { setContentView(v, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); try { behindImageView.setScaleType(ImageView.ScaleType.FIT_XY); behindImageView.setImageBitmap(getBitmap()); } catch (Exception e) { e.printStackTrace(); } } @Override public void setContentView(View v, ViewGroup.LayoutParams params) { super.setContentView(slidingPaneLayout, params); frameLayout.removeAllViews(); frameLayout.addView(v, params); } @Override public void onPanelClosed(View view) { } @Override public void onPanelOpened(View view) { finish(); this.overridePendingTransition(0, 0); } @SuppressLint("NewApi") @Override public void onPanelSlide(View view, float v) { Log.e(TAG, "onPanelSlide ：" + v); //duang duang duang 你可以在这里加入很多特效 behindImageView.setTranslationX(v * defaultTranslationX - defaultTranslationX); shadowImageView.setAlpha(v<0.8?1:(1.5f-v)); } /** * 取得视觉差背景图 * * @return */ public Bitmap getBitmap() { return BitmapFactory.decodeFile(mFileTemp.getAbsolutePath()); } /** * 启动视觉差返回Activity * * @param activity * @param intent */ public void startParallaxSwipeBackActivty(Activity activity, Intent intent) { startParallaxSwipeBackActivty(activity, intent, false); } /** * startParallaxSwipeBackActivty * * @param activity * @param intent * @param isFullScreen */ public void startParallaxSwipeBackActivty(Activity activity, Intent intent, boolean isFullScreen) { screenshots(activity, isFullScreen); startActivity(intent); this.overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_right); } /** * this screeshots form * * @param activity * @param isFullScreen */ public void screenshots(Activity activity, boolean isFullScreen) { try { //View是你需要截图的View View decorView = activity.getWindow().getDecorView(); decorView.setDrawingCacheEnabled(true); decorView.buildDrawingCache(); Bitmap b1 = decorView.getDrawingCache(); // 获取状态栏高度 / Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; Log.e(TAG, "statusBarHeight:" + statusBarHeight); // 获取屏幕长和高 Get screen width and height int width = activity.getWindowManager().getDefaultDisplay().getWidth(); int height = activity.getWindowManager().getDefaultDisplay().getHeight(); // 去掉标题栏 Remove the statusBar Height Bitmap bitmap; if (isFullScreen) { bitmap = Bitmap.createBitmap(b1, 0, 0, width, height); } else { bitmap = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight); } decorView.destroyDrawingCache(); FileOutputStream out = new FileOutputStream(mFileTemp); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); } catch (Exception e) { e.printStackTrace(); } } /** * 根据手机的分辨率从 dip 的单位 转成为 px(像素) */ public int dip2px(float dpValue) { final float scale = getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } }
资源文件：
anim
slide_in_right.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false" android:zAdjustment="top"> <translate android:duration="200" android:fromXDelta="100.0%p" android:toXDelta="0.0" /> </set>
slide_out_right.xml
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false" android:zAdjustment="top"> <translate android:duration="200" android:fromXDelta="0.0" android:toXDelta="100.0%p" /> </set>
drawable
使用方法很简单，当前类继成ParallaxSwipeBackActivity就好了
源码地址：https://github.com/bushijie/ParallaxSwipeBack
