加载网络图片并且随意放大，缩放

之前实现加载一张网络图片并且随意拉大，缩放都比较麻烦，现在使用第三方开源库来实现就很容易。具体实现没什么难度，就直接上代码了。

现在gradle中加入

compile 'com.android.support:design:25.0.0'
compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.github.chrisbanes.photoview:library:1.2.4'
compile 'com.android.support.constraint:constraint-layout:1.0.2'

页面布局如下：

图片界面继承BaseActivity

/**
 * Created by an on 2017/6/10.
 */

class ImagViewActivity extends BaseActivity{
    private Bitmap mBitmap;
    private PhotoViewAttacher mAttacher;
    private ImageView img;
    private Toolbar toolbar;

    @Override
    public int getLayoutId() {
        return R.layout.activity_imgeview;
    }
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            toolbar = (Toolbar) findViewById(R.id.toolbar);
            img = (ImageView) findViewById(R.id.iv_gril);
            setToolbar();
            initData();
        }
    private void setToolbar() {
        toolbar.setTitle("选择日期");
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }

    private void initData() {
       String mImgUrl = getIntent().getStringExtra("url");
        ImageLoader.load(this, mImgUrl, new SimpleTarget() {
            @Override
            public void onResourceReady(Bitmap resource, GlideAnimation glideAnimation) {
                mBitmap = resource;
                img.setImageBitmap(mBitmap);
                //进行缩放查看图片
                mAttacher = new PhotoViewAttacher(img);
            }

        });
    }
}

图片加载的封装类

public class ImageLoader {
    public static void load(Context context, String url, ImageView imageView) {
        if (!TextUtils.isEmpty(url)) {
            Glide.with(context)
                    .load(url)
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(imageView);

        }
    }

    public static void load(Context context, String url, SimpleTarget target) {
        if (!TextUtils.isEmpty(url)) {
            Glide.with(context)
                    .load(url)
                    .asBitmap()
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(target);

        }
    }

    public static void load(Context context, ImageView imageView) {
        Glide.with(context)
                .load(R.drawable.default_img)
                .placeholder(R.drawable.default_img)
                .into(imageView);
    }

}

BaseActivity封装如下：

/**
 * Created by an on 2017/6/10.
 */
public abstract class BaseActivity extends AppCompatActivity {
    //定义一个Activity管理器
    private List mActivitys=new ArrayList<>();
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutId());
        mActivitys.add(this);
        ButterKnife.bind(this);
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        mActivitys.remove(this);
    }
    //退出所有的Activity
    public void finishAll(){
        for (Activity activity:mActivitys) {
            if (activity!=null) {
                activity.finish();
            }
        }
    }
    //设置标题栏
    protected void setToolBar(Toolbar toolbar,String title){
        toolbar.setTitle(title);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        toolbar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(Build.VERSION.SDK_INT >=Build.VERSION_CODES.LOLLIPOP){
                    finishAfterTransition();
                }else{
                    finish();
                }
            }
        });
    }
    public abstract int getLayoutId();
}

就是这么简单。