1. 首页
  2. 问答
  3. 创建使用GridView和画廊图像意图

创建使用GridView和画廊图像意图

2013-12-12 78 views
0

我创建一个图片库图片的Android应用程序，用户可以选择从组图片被存在于GridView任何图片，系统将返回所选项目的第一个活动，显示图像。创建使用GridView和画廊图像意图

问题是，当我点击按钮去第二个活动（ImageGalleryActivity）的GridView不存在和图片集不存在任何人都可以帮助我解决这个问题？

MainActivity.java

package com.devleb.harrypottergallery; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ImageView; 

public class MainActivity extends Activity implements OnClickListener { 

    ImageView imgBig, imgBtn; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    imgBig = (ImageView)findViewById(R.id.imgv); 
    imgBtn = (ImageView)findViewById(R.id.btn_img); 
    imgBtn.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) { 
     // TODO Auto-generated method stub 

     Intent i = new Intent(this, ImageGalleryActivity.class); 
     startActivity(i); 
    } 

}

ImageGalleryActivity.java

package com.devleb.harrypottergallery; 

import android.app.Activity; 
import android.content.Context; 
import android.os.Bundle; 
import android.test.suitebuilder.annotation.SmallTest; 
import android.view.Menu; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 

public class ImageGalleryActivity extends Activity implements 
     OnItemClickListener { 

    GridView gridV; 

    ImageView imgg; 

    // array of small images 
    public Integer[] smallImage = new Integer[] { R.drawable.smallpic01, 
      R.drawable.smallpic02, R.drawable.smallpic03, 
      R.drawable.smallpic04, R.drawable.smallpic05, 
      R.drawable.smallpic06, R.drawable.smallpic07, 
      R.drawable.smallpic08, R.drawable.smallpic09, 
      R.drawable.smallpic10, R.drawable.smallpic11, 
      R.drawable.smallpic12, R.drawable.smallpic13, 
      R.drawable.smallpic14, R.drawable.smallpic15, 
      R.drawable.smallpic16, R.drawable.smallpic17, 
      R.drawable.smallpic18, R.drawable.smallpic19, 
      R.drawable.smallpic20, R.drawable.smallpic21, 
      R.drawable.smallpic22, R.drawable.smallpic23, 
      R.drawable.smallpic24, R.drawable.smallpic25, 
      R.drawable.smallpic26, R.drawable.smallpic27, 
      R.drawable.smallpic28, R.drawable.smallpic29, R.drawable.smallpic30 }; 

    // array of large images 
    Integer[] largImage = new Integer[] { R.drawable.pic01, R.drawable.pic02, 
      R.drawable.pic03, R.drawable.pic04, R.drawable.pic05, 
      R.drawable.pic06, R.drawable.pic07, R.drawable.pic08, 
      R.drawable.pic09, R.drawable.pic10, R.drawable.pic11, 
      R.drawable.pic12, R.drawable.pic13, R.drawable.pic14, 
      R.drawable.pic15, R.drawable.pic16, R.drawable.pic17, 
      R.drawable.pic18, R.drawable.pic19, R.drawable.pic20, 
      R.drawable.pic21, R.drawable.pic22, R.drawable.pic23, 
      R.drawable.pic24, R.drawable.pic25, R.drawable.pic26, 
      R.drawable.pic27, R.drawable.pic28, R.drawable.pic29, 
      R.drawable.pic30 }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_image_gallery); 

     gridV = (GridView) findViewById(R.id.grid_v); 
     gridV.setAdapter(new GalleryIMGAdapter(this)); 
     gridV.setOnItemClickListener(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.image_gallery, menu); 
     return true; 
    } 

    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
     // TODO Auto-generated method stub 

     ViewImage(arg2); 

    } 

    private void ViewImage(int arg2) { 
     // TODO Auto-generated method stub 

     setContentView(R.layout.activity_main); 
     imgg = (ImageView) findViewById(R.id.imgv); 
     imgg.setImageResource(largImage[arg2]); 
    } 

} 

class GalleryIMGAdapter extends BaseAdapter { 

    private Context mc; 

    public GalleryIMGAdapter(Context c) { 
     this.mc = c; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getItemId(int arg0) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertview, ViewGroup parent) { 
     // TODO Auto-generated method stub 

     ImageView img; 

     if (convertview == null) { 
      img = new ImageView(mc); 
      img.setLayoutParams(new GridView.LayoutParams(200, 180)); 
      img.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      img.setPadding(8, 8, 8, 8); 
     } 
     return null; 
    } 

}

ImageGalleryActivity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".ImageGalleryActivity" > 

    <GridView 
     android:id="@+id/grid_v" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="18dp" 
     android:columnWidth="90dp" 
     android:gravity="center" 
     android:horizontalSpacing="10dp" 
     android:numColumns="3" 
     android:stretchMode="columnWidth" 
     android:verticalSpacing="10dp" > 
    </GridView> 

</RelativeLayout>

日志猫

12-12 13:16:48.745: E/AndroidRuntime(1959): FATAL EXCEPTION: main 
12-12 13:16:48.745: E/AndroidRuntime(1959): java.lang.NullPointerException 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.AbsListView.obtainView(AbsListView.java:2163) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.GridView.onMeasure(GridView.java:1040) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.View.measure(View.java:15848) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.RelativeLayout.measureChild(RelativeLayout.java:698) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:494) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.View.measure(View.java:15848) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.View.measure(View.java:15848) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:302) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.View.measure(View.java:15848) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.View.measure(View.java:15848) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.os.Handler.handleCallback(Handler.java:730) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.os.Looper.loop(Looper.java:137) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at java.lang.reflect.Method.invoke(Method.java:525) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
12-12 13:16:48.745: E/AndroidRuntime(1959):  at dalvik.system.NativeStart.main(Native Method)

来源

2013-12-12 user3006788

回答

1

变化

@Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return 0; 
    }

到

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    return smallImage.length; 
}

在getView而不是null也返回

return img;

。

而且下面添加在getView

img.setImageResource(smallImage[position])

让GalleryIMGAdapter一个内部类库图片活动

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".ImageGalleryActivity" > 

    <GridView 
     android:id="@+id/grid_v" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="18dp" 
     android:columnWidth="90dp" 
     android:gravity="center" 
     android:horizontalSpacing="10dp" 
     android:numColumns="3" 
     android:stretchMode="columnWidth" 
     android:verticalSpacing="10dp" > 
    </GridView> 

</RelativeLayout>

然后，你必须

setContentView(R.layout.activity_main); 
imgg = (ImageView) findViewById(R.id.imgv);

在相同的情况也有setContentView两次activtiy是一个糟糕的设计。

编辑：

public class ImageGalleryActivity extends Activity implements 
     OnItemClickListener { 

    GridView gridV; 
    public Integer[] smallImage = new Integer[] { 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher, 
      R.drawable.ic_launcher, R.drawable.ic_launcher,}; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     gridV = (GridView) findViewById(R.id.grid_v); 
     gridV.setAdapter(new GalleryIMGAdapter(this)); 
     gridV.setOnItemClickListener(this); 
    } 
    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
     // TODO Auto-generated method stub 

    } 

    class GalleryIMGAdapter extends BaseAdapter { 

     private Context mc; 

     public GalleryIMGAdapter(Context c) { 
      this.mc = c; 
     } 

     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return smallImage.length; 
     } 

     @Override 
     public Object getItem(int arg0) { 
      // TODO Auto-generated method stub 
      return null; 
     } 

     @Override 
     public long getItemId(int arg0) { 
      // TODO Auto-generated method stub 
      return 0; 
     } 

     @Override 
     public View getView(int position, View convertview, ViewGroup parent) { 
      // TODO Auto-generated method stub 

      ImageView img; 
       img = new ImageView(mc); 
       img.setLayoutParams(new GridView.LayoutParams(200, 180)); 
       img.setScaleType(ImageView.ScaleType.CENTER_CROP); 
       img.setPadding(8, 8, 8, 8); 
       img.setImageResource(smallImage[position]); 

      return img; 
     } 
    } 
}

快

enter image description here

来源

2013-12-12 13:03:12 Raghunandan

+0

系统给我的错误，当我写smallImage错误：** smallImage不能被解析为一个变量** – user3006788

+0

@ user3006788使您的适配器类是您活动的内部类。 smallImage的ACOPE是活动 – Raghunandan

+0

内@ user3006788检查我删除不需要的代码编辑。只是改变我使用启动图像的图像。你只更改smallImage数组。修改代码accrodingly – Raghunandan

相关问题

 相关问题