Question

我在Android中有点新手并且真的想学习它但却陷入了一个教程。本教程是关于使用一些文本在gridview下载和显示图像。到目前为止，我得到的图像，文字和一切。当我想从该gridview打开项目并显示大图像和文本时，会出现问题。我能够显示图像，但我无法弄清楚如何通过意图传递文本。这是活动1

public class Main extends Activity {

public static final int DIALOG_DOWNLOAD_JSON_PROGRESS = 0;
private ProgressDialog mProgressDialog;
public String resultServer = "";
public String text;
ArrayList<HashMap<String, Object>> MyArrList;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    // Download JSON File   
    new DownloadJSONFileAsync().execute();

}


@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DIALOG_DOWNLOAD_JSON_PROGRESS:
        mProgressDialog = new ProgressDialog(this);
        mProgressDialog.setMessage("Loading.....");
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        mProgressDialog.setCancelable(true);
        mProgressDialog.show();
        return mProgressDialog;
    default:
        return null;
    }
}

// Show All Content
public void ShowAllContent()
{
    // gridView1
    final GridView gridV = (GridView)findViewById(R.id.gridView1); 
    gridV.setAdapter(new ImageAdapter(Restaurants.this,MyArrList));

    // OnClick
    gridV.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v,
            int position, long id) {
            String Position = String.valueOf(position);

            Intent newActivity = new Intent(Main.this,MainTwo.class);
            newActivity.putExtra("Position", Position);
            newActivity.putExtra("resultServer", resultServer);
            newActivity.putExtra("text", resultServer);
            startActivity(newActivity);

        }
    });
}

我已将此行添加到Intent newActivity - ＆gt; newActivity.putExtra("text", resultServer); 这是活动2 -

public class MainTwo extends Activity {

public static final int DIALOG_DOWNLOAD_JSON_PROGRESS = 0;
private ProgressDialog mProgressDialog;

public int curPosition  = 0;
public String resultServer;
public ArrayList<HashMap<String, Object>> MyArrList;


@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_two);


    Intent intent= getIntent();
    curPosition = Integer.parseInt(intent.getStringExtra("Position")); 
    resultServer = String.valueOf(intent.getStringExtra("resultServer")); 
    resultServer = String.valueOf(intent.getStringExtra("text"));

    try {
        MyArrList = ConvertJSONtoArrayList(resultServer);

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    Log.d("ArrayList Size",String.valueOf(MyArrList.size()));

    // Show Image Full
    new DownloadFullPhotoFileAsync().execute();

    // Button Home
    final Button home = (Button) findViewById(R.id.btnHome);
    // Perform action on click
    home.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Intent newActivity = new Intent(MainTwo.this, Main.class);
            startActivity(newActivity);
        }
    });

}

// Show Image Full
public void ShowImageFull(String imageName, Bitmap imgFull)
{

     ImageView image = (ImageView) findViewById(R.id.fullimage);

     try
     {
        image.setImageBitmap(imgFull);
     } catch (Exception e) {
         // When Error
        image.setImageResource(android.R.drawable.ic_menu_report_image);
     }

     // Show Toast
    Toast.makeText(MainTwo.this,imageName,Toast.LENGTH_LONG).show();  

}

public ArrayList<HashMap<String, Object>> ConvertJSONtoArrayList(String json) throws JSONException
{

    JSONArray data = new JSONArray(resultServer);

    ArrayList<HashMap<String, Object>> arr = new ArrayList<HashMap<String, Object>>();
    HashMap<String, Object> map;

    for(int i = 0; i < data.length(); i++){
        JSONObject c = data.getJSONObject(i);
        map = new HashMap<String, Object>();
        map.put("ImageID", (String)c.getString("id"));
        map.put("ImageName", (String)c.getString("name"));
        map.put("ImagePathThum", (String)c.getString("image"));
        map.put("ImagePathFull", (String)c.getString("rest_img_big"));
        map.put("text", (String)c.getString("text"));

        arr.add(map);
    }

    return arr;

}

这里我添加了for块 - ＆gt; map.put（＆＃34; text＆＃34;，（String）c.getString（＆＃34; text＆＃34;））;`

并获取意图部分resultServer = String.valueOf(intent.getStringExtra("text")); 这是main_two.xml我看到Home按钮，空格应该是text和大图片。

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tableLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<TableRow
  android:id="@+id/tableRow1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" >

 <Button
     android:id="@+id/btnHome"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Home" />

</TableRow>

<View
    android:layout_height="1dip"
    android:background="#CCCCCC" />
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">   
<TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout> 
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_weight="0.1">   

<ImageView
    android:id="@+id/fullimage"
    android:layout_width="match_parent"
    android:layout_height="380dp" />

</LinearLayout>

<View
    android:layout_height="1dip"
    android:background="#CCCCCC" />

<LinearLayout
  android:id="@+id/LinearLayout1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:padding="5dip" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

</TableLayout>

如果您需要更多来源，我会发布。可能是非常蹩脚的问题，但我无法理解。请帮忙。更新

@Override
    protected Void doInBackground(String... params) {
        // TODO Auto-generated method stub

        String url = "URL to download data";

        JSONArray data;
        try {
            resultServer = getJSONUrl(url);
            data = new JSONArray(resultServer);

            MyArrList = new ArrayList<HashMap<String, Object>>();
            HashMap<String, Object> map;

            for(int i = 0; i < data.length(); i++){
                JSONObject c = data.getJSONObject(i);
                map = new HashMap<String, Object>();
                map.put("id", (String)c.getString("id"));
                map.put("name", (String)c.getString("name"));
                map.put("text", (String)c.getString("text"));

                // Thumbnail Get ImageBitmap To Bitmap
                map.put("ImagePathThum", (String)c.getString("image"));
                map.put("ImageThumBitmap", (Bitmap)loadBitmap(c.getString("image")));

                // Full (for View Full)
                map.put("ImagePathFull", (String)c.getString("rest_img_big"));

                MyArrList.add(map);
            }


        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

Answer 1

尝试仅传递特定项目的完整图像路径和文本而不是json数组字符串：

如何从第一项活动传递：

gridV.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   public void onItemClick(AdapterView<?> parent, View v,int position, long id) {
     Intent newActivity = new Intent(Main.this,MainTwo.class);
     newActivity.putExtra("image", MyArrList.get(position).get("imagePathFull").toString());
     newActivity.putExtra("text", MyArrList.get(position).get("text").toString());
     startActivity(newActivity);
   }
});

如何开展第二项活动：

 String fullImagePath;
 String text;

 fullImagePath = getIntent().getStringExtra("imagePathFull");
 text = getIntent().getStringExtra("text");

在Android中放置并获取意图

1 个答案: