不能从另一个活动调用 Gridview 活动

Question

这是我之前的问题How to call the Gridview Activity from another activity 的更新，我添加了我的代码

这是我的画廊.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:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>

图库.java

 package com.example.diaz.chmscadvertisement;


 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.widget.GridView;

 public class Gallery extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery);

    GridView gridview = (GridView) findViewById(R.id.gridview);
    gridview.setAdapter(new ImageAdapter(this));
 }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}
}

ImageAdapter.java

 package com.example.diaz.chmscadvertisement;

 import android.content.Context;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.GridView;
 import android.widget.ImageView;

 /**
  * Created by diaz on 10/10/2015.
  */
      public class ImageAdapter extends BaseAdapter {
     private Context mContext;

     public ImageAdapter(Context c) {
         mContext = c;
     }

     public int getCount() {
         return mThumbIds.length;
     }

     public Object getItem(int position) {
         return null;
     }

     public long getItemId(int position) {
         return 0;
     }

     // create a new ImageView for each item referenced by the Adapter
     public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if (convertView == null) {
        // if it's not recycled, initialize some attributes
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8, 8, 8, 8);
    } else {
        imageView = (ImageView) convertView;
    }

    imageView.setImageResource(mThumbIds[position]);
    return imageView;
}

// references to our images
private Integer[] mThumbIds = {
        R.drawable.sample2, R.drawable.sample3,
        R.drawable.sample4, R.drawable.sample5,
        R.drawable.sample6, R.drawable.sample7,
        R.drawable.sample10, R.drawable.sample1,
        R.drawable.sample8, R.drawable.sample9,

};
 }

清单.xml

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/logoalijis"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity android:name=".ViewFlipperBody" />
        <activity android:name=".AboutChmsc" />
        <activity android:name=".CampusLife" />
        <activity android:name=".AboutUs" />
        <activity android:name=".MainMenu"></activity>
        <activity android:name=".Gallery"/>
        <activity
            android:name=".SplashScreen"
            android:label="CHMSC-Alijis" >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

我的主菜单这是我按下按钮以打开 Gridview 的地方

MainMenu.java

package com.example.diaz.chmscadvertisement;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;


public class MainMenu extends Activity implements View.OnClickListener {

Button button2;
Button button3;
Button button4;
Button button6;
Button button7;


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

        button2 = (Button) findViewById(R.id.button2);
        button3 = (Button) findViewById(R.id.button3);
        button4 = (Button) findViewById(R.id.button4);
        button6 = (Button) findViewById(R.id.button6);
        button7 = (Button) findViewById(R.id.button7);

        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
        button4.setOnClickListener(this);
        button6.setOnClickListener(this);
        button7.setOnClickListener(this);

    }

    public void onClick(View v){
        if (v.getId() == R.id.button2) {
            Intent intent = new Intent(this, ViewFlipperBody.class);
            this.startActivity(intent);

        } else if (v.getId() == R.id.button3) {
            Intent intent = new Intent(this, AboutChmsc.class);
            this.startActivity(intent);

        } else if (v.getId() == R.id.button4) {
            Intent intent = new Intent(this, CampusLife.class);
            this.startActivity(intent);
        }

        else if (v.getId() == R.id.button6) {
            Intent intent = new Intent(this, Gallery.class);
            this.startActivity(intent);
        }

        else if (v.getId() == R.id.button7) {
            Intent intent = new Intent(this, AboutUs.class);
            this.startActivity(intent);
        }

    }
}

问题是当我单击 Gallery 按钮（即 MainMenu.java 中的 button6）时，gallery.xml 根本没有打开。如果我用 R.drawable.icon_launcher 替换 mThumbIds 的元素，它将正常工作。知道吗？提前致谢

Answer 1

您应该在gallery.xml中添加一个布局来包裹GridView，否则它的宽度和高度将是0dp。

Answer 2

如果图像不可用，您的 Gridview 将不会显示。请使用 ic_launcher 代替示例图像尝试相同的代码。

Answer 3

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
    <GridView 
    android:id="@+id/gridview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center"/>
</merge>