android网络图片查看器

刺骨的言语ヽ痛彻心扉 2022-08-06 04:26 201阅读 0赞

可以先启动一个tomcat服务器，在网络上放一张图片

布局

mainactivity

package cn.wonders.image;
    
    import cn.wonders.service.ImageService;
    import android.support.v7.app.ActionBarActivity;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.Toast;
    
    public class MainActivity extends ActionBarActivity {
        private EditText et;
        private ImageView ev;
        private Bitmap bitmap;
        
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.fragment_main);
    //		final EditText et = (EditText) this.findViewById(R.id.imagepath);
    		et = (EditText) this.findViewById(R.id.imagepath);
    		Button button = (Button) this.findViewById(R.id.button);
    //		final ImageView ev = (ImageView) this.findViewById(R.id.image);
    		ev = (ImageView) this.findViewById(R.id.image);
    		
    		button.setOnClickListener(new ButtonClickListener());
    //		button.setOnClickListener(new View.OnClickListener() {
    //			
    //			@Override
    //			public void onClick(View v) {
    //				// 使用匿名内部类，隐式调用外部变量，外部变量需要final修饰。
    //				String path = et.getText().toString();
    //				byte[] data;
    //				try {
    //					data = ImageService.getImage(path);
    //					Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
    //					ev.setImageBitmap(bitmap);
    //				} catch (Exception e) {
    //					e.printStackTrace();
    //					Toast.makeText(getApplicationContext(), R.string.error, Toast.LENGTH_LONG).show();
    //				}
    //				//生成位图对象
    //				//显示图片
    //			}
    //		});
    		
    //		if (savedInstanceState == null) {
    //			getSupportFragmentManager().beginTransaction()
    //					.add(R.id.container, new PlaceholderFragment()).commit();
    //		}
    	}
    
    	Handler handler = new Handler() {
    		@Override
    	    public void handleMessage(Message msg) {
    	        super.handleMessage(msg);
    	        ev.setImageBitmap(bitmap);
    	    }
    	};
    	
    	
    	private final class ButtonClickListener implements View.OnClickListener{
    
    		public void onClick(View v) {
    //			String path = et.getText().toString();
    			try{
    				new Thread(){
    					@Override
    					public void run(){
    						//你要执行的方法
    						//执行完毕后给handler发送一个空消息
    						try{
    							String path = et.getText().toString();
    							byte[] data = ImageService.getImage(path);
    							bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
    							handler.sendEmptyMessage(0);
    						}catch (Exception e) {
    							e.printStackTrace();
    							Toast.makeText(getApplicationContext(), R.string.error, Toast.LENGTH_LONG).show();
    						}
    					}
    				}.start();
    //				byte[] data = ImageService.getImage(path);
    //				Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
    //				ev.setImageBitmap(bitmap);//显示图片
    				
    			}catch (Exception e) {
    				e.printStackTrace();
    				Toast.makeText(getApplicationContext(), R.string.error, Toast.LENGTH_LONG).show();
    			}
    		}
        }
    	
    
    }

工具类

package cn.wonders.utils;
    
    import java.io.ByteArrayOutputStream;
    import java.io.InputStream;
    
    public class StreamTool {
    
    	public static byte[] read(InputStream input) throws Exception {
    		ByteArrayOutputStream baos = new ByteArrayOutputStream();
    		byte[] buffer = new byte[1024];
    		int len = 0;
    		while((len=input.read(buffer))!=-1) {
    			baos.write(buffer, 0, len);
    		}
    		input.close();
    		return baos.toByteArray();
    	}
    
    }