今天的认识了一个开源代码PhotoView，主要就是实现图片点击放大的功能，那么这个玩意儿怎么使用呢， 第一步1.Gradle添加依赖 (推荐)
dependencies { compile 'com.bm.photoview:library:1.4.0' } 或者也可以将项目下载下来，将Info.Java和PhotoView.java两个文件拷贝到你的项目中，（不推荐） 第二步在xml中添加：
<ImageView android:id="@+id/onclick" android:clickable="true" android:onClick="onClick" android:layout_width="100dp" android:layout_height="100dp" android:src="@mipmap/ic_launcher" /> <FrameLayout android:id="@+id/parent" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="gone">
<ImageView
android:id="@+id/bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff000000" />
<com.bm.library.PhotoView
android:id="@+id/img"
android:layout_width="match_parent"
android:layout_height="match_parent"></com.bm.library.PhotoView>
</FrameLayout>
第三步在java代码中的引用：
public class MainActivity extends AppCompatActivity { View mBg; PhotoView mPhotoView; Info mInfo; View mParent; AlphaAnimation in = new AlphaAnimation(0, 1); AlphaAnimation out = new AlphaAnimation(1, 0); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); in.setDuration(300); out.setDuration(300); out.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mBg.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
mParent = findViewById(R.id.parent);
mBg = findViewById(R.id.bg);
mPhotoView = (PhotoView) findViewById(R.id.img);
mPhotoView.setScaleType(ImageView.ScaleType.FIT_START);
mPhotoView.enable();
mPhotoView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mBg.startAnimation(out);
mPhotoView.animaTo(mInfo, new Runnable() {
@Override
public void run() {
mParent.setVisibility(View.GONE);
}
});
}
});
}
public void onClick(View view){
PhotoView p = (PhotoView) findViewById(R.id.img);
mInfo = p.getInfo();
mPhotoView.setImageResource(R.mipmap.ic_launcher);
mBg.startAnimation(in);
mBg.setVisibility(View.VISIBLE);
mParent.setVisibility(View.VISIBLE);;
mPhotoView.animaFrom(mInfo);
}
@Override
public void onBackPressed() {
if (mParent.getVisibility() == View.VISIBLE) {
mBg.startAnimation(out);
mPhotoView.animaTo(mInfo, new Runnable() {
@Override
public void run() {
mParent.setVisibility(View.GONE);
}
});
} else {
super.onBackPressed();
}
}