android listview仿ios 3dTouch效果

最近项目上要求在listview上实现类似ios 3dTouch功能，现在网上搜索一番，发现该文章很好的实现了这个功能，于是在这文章的基础上我自己做了一个改进。效果如图所示：

                                 

实现思路：

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。