1.截取图片
// 获取屏幕照片 public static Bitmap captureScreen(Activity activity) { activity.getWindow().getDecorView().setDrawingCacheEnabled(true); Bitmap bmp = activity.getWindow().getDecorView().getDrawingCache(); return bmp; }2.做高斯模糊处理
// 高斯模糊处理 private Bitmap blur(Bitmap bitmap, float radius) { Bitmap output = Bitmap.createBitmap(bitmap); // 创建输出图片 RenderScript rs = RenderScript.create(this); // 构建一个RenderScript对象 ScriptIntrinsicBlur gaussianBlue = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); // // 创建高斯模糊脚本 Allocation allIn = Allocation.createFromBitmap(rs, bitmap); // 开辟输入内存 Allocation allOut = Allocation.createFromBitmap(rs, output); // 开辟输出内存 gaussianBlue.setRadius(radius); // 设置模糊半径，范围0f<radius<=25f gaussianBlue.setInput(allIn); // 设置输入内存 gaussianBlue.forEach(allOut); // 模糊编码，并将内存填入输出内存 allOut.copyTo(output); // 将输出内存编码为Bitmap，图片大小必须注意 rs.destroy(); // 关闭RenderScript对象，API>=23则使用rs.releaseAllContexts() return output; }3.按压实现动态高斯模糊 思路：布局的时候下面一张高斯模糊的图片，上面高斯模糊的图片，对上面的图片进行动态透明度变化，这时候看效果就是动态高斯模糊了 4.在按压位置出现一个新的控件浮在上面 思路：动态添加view，通过计算点击位置获取listview的item位置，给该view设置setMargins控制其位置 5.优化 代码：xml文件
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/root" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/test_list" android:layout_width="match_parent" android:layout_height="match_parent"> </ListView> <ImageView android:id="@+id/image_down" android:layout_width="match_parent" android:layout_height="match_parent" /> <ImageView android:id="@+id/image_up" android:layout_width="match_parent" android:layout_height="match_parent" /> <TextView android:id="@+id/item_tv_ss" android:layout_width="match_parent" android:layout_height="50dp" android:textSize="30sp" android:background="#ffffff" /> </RelativeLayout> Activity文件 package memorandum.ios.csc.com.memorandum.activity; import android.app.Activity; import android.graphics.Bitmap; import android.os.Bundle; import android.renderscript.Allocation; import android.renderscript.Element; import android.renderscript.RenderScript; import android.renderscript.ScriptIntrinsicBlur; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.ImageView; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.SimpleAdapter; import android.widget.TextView; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import memorandum.ios.csc.com.memorandum.R; /** * Created by csc on 17-7-31. */ public class TestActivity extends Activity{ private ListView testListView; private List<Map<String, String>> data; private ImageView imageUp, imageDown; private Bitmap sampleImg; private Bitmap gaussianBlurImg; private int count = 0; private View attachedView; private RelativeLayout rootRl; private TextView testTv; RelativeLayout.LayoutParams lp; private boolean is3DTouch = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //取消标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); //取消状态栏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.test); initData(); imageUp = (ImageView) findViewById(R.id.image_up); imageDown = (ImageView) findViewById(R.id.image_down); testListView = (ListView) findViewById(R.id.test_list); testListView.setAdapter(new SimpleAdapter(this, data, R.layout.listview_item, new String[]{"name"}, new int[]{R.id.item_tv})); attachedView = View.inflate(this,R.layout.listview_item,null); rootRl = (RelativeLayout) findViewById(R.id.root); testTv = (TextView)findViewById(R.id.item_tv_ss); lp = new RelativeLayout.LayoutParams(testTv.getLayoutParams()); testListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) { count = 0; sampleImg = captureScreen(TestActivity.this); imageUp.setVisibility(View.VISIBLE); imageDown.setVisibility(View.VISIBLE); imageUp.setImageBitmap(sampleImg); gaussianBlurImg = blur(sampleImg, 25f);// 高斯模糊图片 imageDown.setImageBitmap(gaussianBlurImg); imageUp.setImageAlpha(255); HashMap item = (HashMap)testListView.getItemAtPosition(i); String section =String.valueOf(item.get("name").toString());//get每一行的数据的名字 testTv.setText(section); int[] location = new int[2] ; testListView.getChildAt(i-testListView.getFirstVisiblePosition()).getLocationOnScreen(location); lp.setMargins(0, location[1], 0, 0); testTv.setLayoutParams(lp); testTv.setVisibility(View.VISIBLE); is3DTouch = true; return false; } }); testListView.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent motionEvent) { switch (motionEvent.getAction()) { case MotionEvent.ACTION_DOWN: break; case MotionEvent.ACTION_MOVE: if(is3DTouch){ if (count < 255) count = count + 8; int alpha = 255 - count; if (alpha < 0) alpha = 0; imageUp.setImageAlpha(alpha); } break; case MotionEvent.ACTION_UP: if(is3DTouch){ imageUp.setImageAlpha(255); testTv.setVisibility(View.GONE); imageUp.setVisibility(View.GONE); imageDown.setVisibility(View.GONE); is3DTouch = false; } break; } return false; } }); } private void initData() { data = new ArrayList<Map<String, String>>(); for (int i = 0; i < 20; i++) { Map<String, String> map = new HashMap<String, String>(); map.put("name", "BYXD" + i); data.add(map); } } // 高斯模糊处理 private Bitmap blur(Bitmap bitmap, float radius) { Bitmap output = Bitmap.createBitmap(bitmap); // 创建输出图片 RenderScript rs = RenderScript.create(this); // 构建一个RenderScript对象 ScriptIntrinsicBlur gaussianBlue = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); // // 创建高斯模糊脚本 Allocation allIn = Allocation.createFromBitmap(rs, bitmap); // 开辟输入内存 Allocation allOut = Allocation.createFromBitmap(rs, output); // 开辟输出内存 gaussianBlue.setRadius(radius); // 设置模糊半径，范围0f<radius<=25f gaussianBlue.setInput(allIn); // 设置输入内存 gaussianBlue.forEach(allOut); // 模糊编码，并将内存填入输出内存 allOut.copyTo(output); // 将输出内存编码为Bitmap，图片大小必须注意 rs.destroy(); // 关闭RenderScript对象，API>=23则使用rs.releaseAllContexts() return output; } // 获取屏幕照片 public static Bitmap captureScreen(Activity activity) { activity.getWindow().getDecorView().setDrawingCacheEnabled(true); Bitmap bmp = activity.getWindow().getDecorView().getDrawingCache(); return bmp; } }到这里就实现了listview动态高斯模糊效果了。接下来对代码进行优化，将效果调到iphone通讯录那样，在该效果后面加个popupmenu，这个有空贴代码。
