package com.roboo.like.netease;
import android.app.ActionBar.LayoutParams;
import android.app.Fragment;
import android.app.FragmentManager.OnBackStackChangedListener;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.Toast;
public class FragmentAnimationActivity extends BaseActivity implements OnBackStackChangedListener
{
private boolean removeBackFragment = false;
private Matrix matrix = new Matrix();
private Matrix savedMatrix = new Matrix();
private static final int NONE = 0;
private static final int DRAG = 1;
private static final int ZOOM = 2;
private int mode = NONE;
// 第一个按下的手指的点
private PointF startPoint = new PointF();
// 两个按下的手指的触摸点的中点
private PointF midPoint = new PointF();
// 初始的两个手指按下的触摸点的距离
private float oriDis = 1f;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setTVTitle(R.string.tv_fragment_animation);
// TODO setContentView Tag
setContentView(R.layout.activity_fragment_animation);
getFragmentManager().beginTransaction().add(R.id.frame_container, FrontFragment.newInstance()).commit();
getFragmentManager().addOnBackStackChangedListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add("切换");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switchoverFragment();
Toast.makeText(this, "切换", Toast.LENGTH_SHORT).show();
return true;
}
private void switchoverFragment()
{
if (removeBackFragment)
{
getFragmentManager().popBackStack();
return;
}
getFragmentManager()
.beginTransaction()
.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out)
.setCustomAnimations(R.animator.card_flip_right_in, R.animator.card_flip_right_out, R.animator.card_flip_left_in,
R.animator.card_flip_left_out).replace(R.id.frame_container, BackFragment.newInstance()).addToBackStack("front").commit();
}
public static class FrontFragment extends Fragment
{
private static FrontFragment newInstance()
{
return new FrontFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
ImageView imageView = new ImageView(getActivity());
imageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
imageView.setScaleType(ScaleType.MATRIX);
imageView.setImageResource(R.drawable.ic_front_fragment);
imageView.setOnTouchListener(((FragmentAnimationActivity)getActivity()).new OnTouchListenerImpl());
return imageView;
}
@Override
public void onPause()
{
System.out.println("FrontFragment :: onPause");
super.onPause();
}
@Override
public void onResume()
{
System.out.println("FrontFragment :: onResume");
super.onResume();
}
}
public static class BackFragment extends Fragment
{
private static BackFragment newInstance()
{
return new BackFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
ImageView imageView = new ImageView(getActivity());
imageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
imageView.setScaleType(ScaleType.MATRIX);
imageView.setImageResource(R.drawable.ic_back_fragment);
imageView.setOnTouchListener(((FragmentAnimationActivity)getActivity()).new OnTouchListenerImpl());
return imageView;
}
@Override
public void onPause()
{
System.out.println("BackFragment :: onPause");
super.onPause();
}
@Override
public void onResume()
{
System.out.println("BackFragment :: onResume");
super.onResume();
}
}
@Override
public void onBackStackChanged()
{
System.out.println("onBackStackChanged()");
if (getFragmentManager().getBackStackEntryCount() > 0)
{
System.out.println("getFragmentManager().getBackStackEntryAt(0) = " + getFragmentManager().getBackStackEntryAt(0).getName());
// 说明addToBackStack 已经执行，
// FrontFargment已经添加到返回栈中，此时BackStack中只有FrontFragment
removeBackFragment = true;
}
else
{
removeBackFragment = false;
}
}
private class OnTouchListenerImpl implements OnTouchListener
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
// 第一个手指按下事件
matrix.set((view).getImageMatrix());
savedMatrix.set(matrix);
startPoint.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
// 第二个手指按下事件
oriDis = distance(event);
if (oriDis > 10f)
{
savedMatrix.set(matrix);
midPoint = middle(event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
// 手指放开事件
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
// 手指滑动事件
if (mode == DRAG)
{
// 是一个手指拖动
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - startPoint.x, event.getY() - startPoint.y);
}
else if (mode == ZOOM)
{
// 两个手指滑动
float newDist = distance(event);
if (newDist > 10f)
{
matrix.set(savedMatrix);
float scale = newDist / oriDis;
matrix.postScale(scale, scale, midPoint.x, midPoint.y);
}
}
break;
}
// 设置ImageView的Matrix
view.setImageMatrix(matrix);
return true;
}
// 计算两个触摸点之间的距离
private float distance(MotionEvent event)
{
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
// 计算两个触摸点的中点
private PointF middle(MotionEvent event)
{
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
return new PointF(x / 2, y / 2);
}
}
}