Androidシミュレーションiosドロップダウン画像の過度なストレッチ効果を拡大する最適な方法

シミュレーションiosのappstoreの中のピクチャーの過度な引張り効果androidシミュレーションiosのドロップダウンはピクチャーの最良の方案を拡大して、カスタマイズしてRecycleViewを拡張して、その原始の機能を保留して、
一.効果図:
二.迅速な実装:
1.主関数コード:

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.we.widget.WeRecycleView;

public class MainActivity extends Activity {

    private WeRecycleView mRecycleView;

    private int mCount = 100;
    private int mDensity;
    private TextView mTitleView;
    private final int COL_3F51B5 = Color.parseColor("#3F51B5");
    private final int RED = Color.red(COL_3F51B5);
    private final int GREEN = Color.green(COL_3F51B5);
    private final int BLUE = Color.blue(COL_3F51B5);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mDensity = (int) getResources().getDisplayMetrics().density;

        mTitleView = findViewById(R.id.title);
       ImageView ivIcon = findViewById(R.id.iv_icon);
        ivIcon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

            }
        });
        mTitleView.setBackgroundColor(Color.argb(0, RED, GREEN, BLUE));

        mRecycleView = findViewById(R.id.recycle);
        mRecycleView.setLayoutManager(new LinearLayoutManager(this));
        mRecycleView.setScrollMode(WeRecycleView.SCROLL_SCALE_HEAD);
        mRecycleView.setMaxScale(4f);
        //   titleBar，   titlebar   ，        
        mRecycleView.setCloseOffset(50 * mDensity);
        mRecycleView.setOnHeadExpandListener(new WeRecycleView.OnHeadExpandListener() {
            @Override
            public void onExpand(float percent) {
                mTitleView.setBackgroundColor(Color.argb((int) (255 * (1 - percent)), RED, GREEN, BLUE));
            }

            @Override
            public void onEnterSafeArea(boolean isEnter) {

            }
        });

        initAdapter();

    }


    private void initAdapter() {
        mRecycleView.setAdapter(new RecyclerView.Adapter() {
            @Override
            public int getItemViewType(int position) {
                return position;
            }

            @NonNull
            @Override
            public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                if (viewType == 0) {
                    final ImageView imageView = new ImageView(MainActivity.this);
                    imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                    imageView.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT
                            , (int) (getResources().getDisplayMetrics().widthPixels * 533f / 800)));
                    return new RecyclerView.ViewHolder(imageView) {
                        @Override
                        public String toString() {
                            return super.toString();
                        }
                    };
                } else {
                    TextView textView = new TextView(MainActivity.this);
                    textView.setTextColor(Color.BLACK);
                    textView.setTextSize(30);
                    textView.setGravity(Gravity.CENTER);
                    textView.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, mDensity * 150));

                    return new RecyclerView.ViewHolder(textView) {
                        @Override
                        public String toString() {
                            return super.toString();
                        }
                    };
                }
            }

            @Override
            public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
                if (position == 0) {
                    ((ImageView) holder.itemView).setImageResource(R.drawable.pic);
                } else {
                    holder.itemView.setBackgroundColor(position % 2 == 0 ? Color.WHITE : Color.parseColor("#F0F0F0"));
                }
            }

            @Override
            public int getItemCount() {
                return mCount;
            }

        });
    }


}

2.レイアウト:

3.Shapeシャドウ効果のある円形ボタンを描画するには:
stop_timer_btn.xml:

shape_sgf.xml:

4.関連ソース:
https://github.com/chengweidev/widget