startActivity intent在位图处理5kb图像上崩溃

时间：2014-12-29 20:40:46

标签： android android-gridview

浏览网页后我无法找到解决方案。 我有两个活动类：ImageActivity（MAIN）和ChunkImageActivity。 另一个类扩展了BaseAdapter，它由ChunkImageActivity调用。 第一个包含三个按钮，我可以通过它选择ImageView应分割的片段数。 当按下三个按钮之一时，第二个由ImageActivity调用。 当一个intent启动ChunkImageActivity时会出现问题，它在setContentView（R.layout.image_grid）中有一个GridView;

1。 ImageActivity 

    package com.example.laptop.gridsplitter;


    import java.util.ArrayList;

    import android.app.Activity;
    import android.content.Intent;
    import android.graphics.Bitmap;
     import android.graphics.drawable.BitmapDrawable;
     import android.os.Bundle;
    import android.view.View;
   import android.view.View.OnClickListener;
   import android.widget.Button;
    import android.widget.ImageView;




 public class ImageActivity extends Activity implements View.OnClickListener {

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    /*
     * Here three, four and five are the id's of the buttons declared as 
     * the contents of the sliding drawer.
     * See main.xml for clarity
     */

    Button b1 = (Button) findViewById(R.id.three);
    Button b2 = (Button) findViewById(R.id.four);
    Button b3 = (Button) findViewById(R.id.five);

    b1.setOnClickListener(this);
    b2.setOnClickListener(this);
    b3.setOnClickListener(this);
  }

 @Override
   public void onClick(View view){

    //chunkNumbers is to tell how many chunks the image should split
    int chunkNumbers = 0;

    /*
     * switch-case is used to find the button clicked 
     * and assigning the actual value to chunkNumbers variable
     */

    switch (view.getId()) {
        case R.id.three:
            chunkNumbers = 9 ;
            break;
        case R.id.four:
            chunkNumbers = 16 ;
            break;
        case R.id.five:
            chunkNumbers = 25 ;
    }
    //Getting the source image to split
    ImageView image = (ImageView) findViewById(R.id.source_image);

    splitImage(image, chunkNumbers);
}



private void splitImage(ImageView image, int chunkNumbers) {

    //For the number of rows and columns of the grid to be displayed
    int rows,cols;

    //For height and width of the small image chunks
    int chunkHeight,chunkWidth;

    //To store all the small image chunks in bitmap format in this list
    ArrayList<Bitmap> chunkedImages = new ArrayList<Bitmap>(chunkNumbers);

    //Getting the scaled bitmap of the source image
    BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
    Bitmap bitmap = drawable.getBitmap();
  Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap,  
  bitmap.getWidth(),bitmap.getHeight(), true);

    rows = cols = (int) Math.sqrt(chunkNumbers);
    chunkHeight = bitmap.getHeight()/rows;
    chunkWidth = bitmap.getWidth()/cols;

    //xCoord and yCoord are the pixel positions of the image chunks
    int yCoord = 0;
    for(int x=0; x<rows; x++){
        int xCoord = 0;
        for(int y=0; y<cols; y++){
  chunkedImages.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord,  chunkWidth,   
  chunkHeight));
      xCoord += chunkWidth;
        }
        yCoord += chunkHeight;
    }

    //Start a new activity to show these chunks into a grid
    Intent intent = new Intent(ImageActivity.this, ChunkedImageActivity.class);
    intent.putParcelableArrayListExtra("image chunks", chunkedImages);
    ImageActivity.this.startActivity(intent);
}
}

我已经确定这五条线路和分割图像的代码是正确的 

** 2. ChunkImageActivity**

   package com.example.laptop.gridsplitter;

   import java.util.ArrayList;
    import java.util.ArrayList;
    import android.app.Activity;
    import android.graphics.Bitmap;
    import android.os.Bundle;
    import android.widget.GridView;

 //This activity will display the small image chunks into a grid view


 public class ChunkedImageActivity extends Activity {

     public void onCreate(Bundle bundle){

        super.onCreate(bundle);
        setContentView(R.layout.image_grid);

       //Getting the image chunks sent from the previous activity
       ArrayList<Bitmap> imageChunks = getIntent().getParcelableArrayListExtra("image 
       chunks");
        //Getting the grid view and setting an adapter to it
        GridView grid = (GridView) findViewById(R.id.gridview);
        grid.setAdapter(new ImageAdapter(this, imageChunks));
        grid.setNumColumns((int) Math.sqrt(imageChunks.size()));
       }
    }

 **3. ImageAdapter**

  package com.example.laptop.gridsplitter;
   import java.util.ArrayList;
     import java.util.ArrayList;
    import android.content.Context;
   import android.graphics.Bitmap;
   import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.GridView;
   import android.widget.ImageView;

//The adapter class associated with the ChunkedImageActivity class
  public class ImageAdapter extends BaseAdapter {

   private Context mContext;
   private ArrayList<Bitmap> imageChunks;
    private int imageWidth, imageHeight;

//constructor
   public ImageAdapter(Context c, ArrayList<Bitmap> images){
       mContext = c;
       imageChunks = images;
       imageWidth = images.get(0).getWidth();
       imageHeight = images.get(0).getHeight();
   }

@Override
public int getCount() {
    return imageChunks.size();
}

@Override
public Object getItem(int position) {
    return imageChunks.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView image;
    if(convertView == null){
        image = new ImageView(mContext);

        /*
         * NOTE: I have set imageWidth - 10 and imageHeight
         * as arguments to LayoutParams class.
         * But you can take anything as per your requirement
         */
     image.setLayoutParams(new GridView.LayoutParams(imageWidth - 10 , imageHeight));
        image.setPadding(0, 0, 0, 0);
    }else{
        image = (ImageView) convertView;
    }
    image.setImageBitmap(imageChunks.get(position));
    return image;
     }
     }

 ** MANIFEST**

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.laptop.gridsplitter"
>

<application
    android:hardwareAccelerated="true"
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".ImageActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".ChunkedImageActivity">
    <action android:name="android.intent.action.VIEW" />
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </activity>


</application>

 </manifest>


    **  LAYOUT**


       1. main.xml:

  ' <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
>
<ImageView android:src="@drawable/katewinslet"
    android:id="@+id/source_image"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

<SlidingDrawer android:id="@+id/split_slider"
    android:layout_alignParentBottom="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:topOffset="230dip"
    android:handle="@+id/split_image"
    android:content="@+id/split_numbers">

    <Button android:id="@id/split_image"
        android:text="@string/button_text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"/>

    <LinearLayout android:id="@id/split_numbers"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button android:id="@+id/three"
            android:text="@string/three"
            android:clickable="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <Button android:id="@+id/four"
            android:text="@string/four"
            android:clickable="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

        <Button android:id="@+id/five"
            android:text="@string/five"
            android:clickable="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

     </LinearLayout>
   </SlidingDrawer>


  2. image_grid.xml:

'<?xml version="1.0" encoding="utf-8"?>
 <GridView xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/gridview"
  android:layout_width="match_parent"
    android:layout_height="match_parent"
  android:gravity="center"
 android:numColumns="auto_fit">
  </GridView>'

启动ChunkImageActivity后，我得到的只是一个黑屏。我怀疑是处理位图的问题，因为它小于50kb图像。 你能帮帮我吗？

注意：我以前使用过Toast.makeText，我注意到直到splitImage一切正常。问题在于arraylist的处理或新活动的开始。

1 个答案:

答案 0 :(得分：0)

您是否尝试过调试并检查是否正在制作arraylist并正确传递给图像适配器？

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