安卓网页html/图片查看器开发——张泽华老师的些许错误

1.在Activity中开发界面，一个url 输入框、一个确定查看按钮、一个ImageView或者TextView。

html的界面Activity代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<EditText
android:id="@+id/et_input_uri"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="@string/et_uri_hint"
android:lines="2"
android:text="http://10.0.2.2:8080/bbsModelV_11270826/pages/index" />

<Button
android:id="@+id/bt_get_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/bt_getimage" />

<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<TextView
android:id="@+id/tv_show_img"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:contentDescription="@string/iv_cntdesc"
android:scaleType="center" />
</ScrollView>

</LinearLayout>

2.编写Activity对应的代码

package com.example.netimgviewer;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.util.ByteArrayBuffer;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private EditText et_url;
private Button btn_view;
private TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_url = (EditText) findViewById(R.id.et_input_uri);
btn_view = (Button) findViewById(R.id.bt_get_img);
tv = (TextView) findViewById(R.id.tv_show_img);
// 注册监听
btn_view.setOnClickListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_get_img:
String imgurl = et_url.getText().toString().trim();
Toast.makeText(this, imgurl, Toast.LENGTH_LONG).show();
try {
tv.setText(getHtml(imgurl));
/**
* iv..setImageBitmap(this.getbitmap(imgurl))
*/
} catch (Exception e) {
// TODO Auto-generated catch block
Toast.makeText(this, imgurl + "地址链接不上！", Toast.LENGTH_LONG)
.show();
e.printStackTrace();
}

break;

default:
break;
}

}

public Bitmap getbitmap(String address) throws Exception {

// 声明 URL
URL url = new URL(address);
// 得到打开的链接
URLConnection conn = url.openConnection();

conn.setRequestProperty("method", "get");
conn.setReadTimeout(5000);
InputStream is = conn.getInputStream();

ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
bos.write(bytes, 0, len);
}

byte[] imgBytes = bos.toByteArray();

return BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length);
}

public String getHtml(String address) throws Exception {

// 声明 URL
URL url = new URL(address);
// 得到打开的链接
URLConnection conn = url.openConnection();

conn.setRequestProperty("method", "get");
conn.setReadTimeout(5000);
InputStream is = conn.getInputStream();
// 得到网页编码类型
String contentType = conn.getContentType();
// 截取等号 = 得到结果如：utf-8、GBK
String type = contentType.split("=")[1];
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
bos.write(bytes, 0, len);
}

byte[] imgBytes = bos.toByteArray();

return new String(imgBytes, type) + "======" + type;
}
}

总结：

我看的是黑马张泽华老师的安卓视频，张泽华老师在很多方面表现出了真正的才气。不过人无完人，张泽华老师在提到Html编码的问题上，出现了些许错误...

编码处理可以使用

String contentType = conn.getContentType();
// 截取等号 = 得到结果如：utf-8、GBK
String type = contentType.split("=")[1];
return new String(imgBytes, type) + "======" + type;