如果说我比别人看得更远些,那是因为我站在了巨人的肩上。
github地址：https://github.com/chrisbanes/PhotoView
介绍
在一般的应用中，总会遇到查看图片的功能，点击图片之后，详细查看，PhotoView这个开源控件就帮我们很好的完成了这个功能。
它继承自ImageView，支持缩放，以及各种手势的监听。
特性
- 通过多点触摸和双击来进行放大。
- 通过轻弹划实现平滑滚动。
- 在带有滚动功能的父类工作的很好（比如ViewPager）
- 允许当显示的矩阵发生发生改变时通知应用，当你需要基于当前缩放/滑动位置来更新你的ui时非常有用。
- 允许当你点击图片时通知应用
使用
1、通过代码附加ImageView使用
ImageView mImageView;
PhotoViewAttacher mAttacher;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Any implementation of ImageView can be used!
mImageView = (ImageView) findViewById(R.id.iv_photo);
// Set the Drawable displayed
Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper);
mImageView.setImageDrawable(bitmap);
// Attach a PhotoViewAttacher, which takes care of all of the zooming functionality.
mAttacher = new PhotoViewAttacher(mImageView);
}
// If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call
attacher.update();
2、通过layout使用。
<uk.co.senab.photoview.PhotoView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_photo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
PS：如果需要旋转图片可以通过setRotationTo，setRotationBy实现，其他相关操作间示例代码：
/*******************************************************************************
* Copyright 2011, 2012 Chris Banes.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package uk.co.senab.photoview.sample;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Random;
import uk.co.senab.photoview.PhotoViewAttacher;
import uk.co.senab.photoview.PhotoViewAttacher.OnMatrixChangedListener;
import uk.co.senab.photoview.PhotoViewAttacher.OnPhotoTapListener;
public class SimpleSampleActivity extends Activity {
static final String PHOTO_TAP_TOAST_STRING = "Photo Tap! X: %.2f %% Y:%.2f %% ID: %d";
static final String SCALE_TOAST_STRING = "Scaled to: %.2ff";
private TextView mCurrMatrixTv;
private PhotoViewAttacher mAttacher;
private Toast mCurrentToast;
private Matrix mCurrentDisplayMatrix = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView mImageView = (ImageView) findViewById(R.id.iv_photo);
mCurrMatrixTv = (TextView) findViewById(R.id.tv_current_matrix);
Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper);
mImageView.setImageDrawable(bitmap);
// The MAGIC happens here!
mAttacher = new PhotoViewAttacher(mImageView);
// Lets attach some listeners, not required though!
mAttacher.setOnMatrixChangeListener(new MatrixChangeListener());
mAttacher.setOnPhotoTapListener(new PhotoTapListener());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public void onDestroy() {
super.onDestroy();
// Need to call clean-up
mAttacher.cleanup();
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem zoomToggle = menu.findItem(R.id.menu_zoom_toggle);
assert null != zoomToggle;
zoomToggle.setTitle(mAttacher.canZoom() ? R.string.menu_zoom_disable : R.string.menu_zoom_enable);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_zoom_toggle:
mAttacher.setZoomable(!mAttacher.canZoom());
return true;
case R.id.menu_scale_fit_center:
mAttacher.setScaleType(ScaleType.FIT_CENTER);
return true;
case R.id.menu_scale_fit_start:
mAttacher.setScaleType(ScaleType.FIT_START);
return true;
case R.id.menu_scale_fit_end:
mAttacher.setScaleType(ScaleType.FIT_END);
return true;
case R.id.menu_scale_fit_xy:
mAttacher.setScaleType(ScaleType.FIT_XY);
return true;
case R.id.menu_scale_scale_center:
mAttacher.setScaleType(ScaleType.CENTER);
return true;
case R.id.menu_scale_scale_center_crop:
mAttacher.setScaleType(ScaleType.CENTER_CROP);
return true;
case R.id.menu_scale_scale_center_inside:
mAttacher.setScaleType(ScaleType.CENTER_INSIDE);
return true;
case R.id.menu_scale_random_animate:
case R.id.menu_scale_random:
Random r = new Random();
float minScale = mAttacher.getMinimumScale();
float maxScale = mAttacher.getMaximumScale();
float randomScale = minScale + (r.nextFloat() * (maxScale - minScale));
mAttacher.setScale(randomScale, item.getItemId() == R.id.menu_scale_random_animate);
showToast(String.format(SCALE_TOAST_STRING, randomScale));
return true;
case R.id.menu_matrix_restore:
if (mCurrentDisplayMatrix == null)
showToast("You need to capture display matrix first");
else
mAttacher.setDisplayMatrix(mCurrentDisplayMatrix);
return true;
case R.id.menu_matrix_capture:
mCurrentDisplayMatrix = mAttacher.getDisplayMatrix();
return true;
case R.id.extract_visible_bitmap:
try {
Bitmap bmp = mAttacher.getVisibleRectangleBitmap();
File tmpFile = File.createTempFile("photoview", ".png",
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS));
FileOutputStream out = new FileOutputStream(tmpFile);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
out.close();
Intent share = new Intent(Intent.ACTION_SEND);
share.setType("image/png");
share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(tmpFile));
startActivity(share);
Toast.makeText(this, String.format("Extracted into: %s", tmpFile.getAbsolutePath()), Toast.LENGTH_SHORT).show();
} catch (Throwable t) {
t.printStackTrace();
Toast.makeText(this, "Error occured while extracting bitmap", Toast.LENGTH_SHORT).show();
}
return true;
}
return super.onOptionsItemSelected(item);
}
private class PhotoTapListener implements OnPhotoTapListener {
@Override
public void onPhotoTap(View view, float x, float y) {
float xPercentage = x * 100f;
float yPercentage = y * 100f;
showToast(String.format(PHOTO_TAP_TOAST_STRING, xPercentage, yPercentage, view == null ? 0 : view.getId()));
}
}
private void showToast(CharSequence text) {
if (null != mCurrentToast) {
mCurrentToast.cancel();
}
mCurrentToast = Toast.makeText(SimpleSampleActivity.this, text, Toast.LENGTH_SHORT);
mCurrentToast.show();
}
private class MatrixChangeListener implements OnMatrixChangedListener {
@Override
public void onMatrixChanged(RectF rect) {
mCurrMatrixTv.setText(rect.toString());
}
}
}
来源：https://www.cnblogs.com/leestar54/p/4220068.html