安卓 : how to get value from assets and pass it thru array

Question

我想通过使用数组来缩短我的代码长度。如果我有 100 个按钮或 ImageView ，我必须写 100 个。我想从 assets 文件夹中获取值(value)并将其传递给 array 。如何使用

String[] colorNames = getResources().getStringArray(R.array.colorList);
String[] animalNames = getResources().getStringArray(R.array.animalList);

当前工作代码:

public class Main extends Activity {

ImageView image;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drag);
    Intent intent = getIntent();
    String key = intent.getStringExtra("YOUR_KEY");
    image = (ImageView) findViewById(R.id.image);

    Button btn1,btn2;
    btn1 = (Button) findViewById(R.id.btn1);
    btn2 = (Button) findViewById(R.id.btn2);

    if(key.equals("animalIntent") )
{
    btn1.setText("cat");
    btn2.setText("dog");

//100 个按钮也一样......................这里我想缩短我的代码

} else {
    btn1.setText("red");
    btn2.setText("blue");
}
}

public void btn1(View view) {
    Intent intent = getIntent();
    String key = intent.getStringExtra("YOUR_KEY");
    if(key.equals("animalIntent") )
    {
        image.setBackgroundResource(R.drawable.cat);

//100 个 ImageView 相同......................这里我想缩短我的代码

    } else {
        image.setBackgroundResource(R.drawable.red);
    }
}

public void btn2(View view) {
    Intent intent = getIntent();
    String key = intent.getStringExtra("YOUR_KEY");
    if(key.equals("animalIntent") )
    {
      image.setBackgroundResource(R.drawable.dog);


    } else {
      image.setBackgroundResource(R.drawable.blue);
    }
}

Answer 1

要做到这一点，您应该使用 GridView，这将是最佳选择。试试下面的示例代码。Step-1 在你的 drag.xml 中添加 gridview

<GridView
        android:id="@+id/grid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edt"
        android:numColumns="2"
        android:stretchMode="columnWidth" >
    </GridView> 

Step-2 声明变量并获取 GridView 引用。

GridView gridview;
     Integer[] drawableIds = { R.drawable.poster1, R.drawable.poster2, R.drawable.poster3, R.drawable.poster4,
            R.drawable.poster5 };
    String[] colorNames = { "poster one", "poster two", "poster three", "poster four", "poster five" };

//在OnCreate()方法中添加

gridview = (GridView) findViewById(R.id.grid);
        gridview.setAdapter(new CustomGridAdapter(this, drawableIds, colorNames));
        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

                Toast.makeText(Main.this, "" + position, Toast.LENGTH_LONG).show();
            }
        });

Step-3 为网格适配器 CustomGridAdapter.class 创建一个类

public class CustomGridAdapter extends BaseAdapter {

    private Context context;
    private Integer[] drawableitems;
    private String[] drawablelabel;

    public CustomGridAdapter(Context context, Integer[] drawableitems, String[] drawablelabel) {

        this.context = context;
        this.drawablelabel = drawablelabel;
        this.drawableitems = drawableitems;

    }

    @Override
    public int getCount() {
        return drawableitems.length;
    }

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

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

    public View getView(int position, View convertView, ViewGroup parent) {

        RecordHolder holder = null;

        if (convertView == null) {

            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            holder = new RecordHolder();
            convertView = inflater.inflate(R.layout.grid_item, null);
            holder.txtTitle = (TextView) convertView.findViewById(R.id.grid_item_label);

            holder.imageItem = (ImageView) convertView.findViewById(R.id.grid_item_image);

            convertView.setTag(holder);

        } else {
            holder = (RecordHolder) convertView.getTag();
        }

        holder.txtTitle.setText(drawablelabel[position]);
        holder.imageItem.setImageResource(drawableitems[position]);
        return convertView;
    }

    static class RecordHolder {
        TextView txtTitle;
        ImageView imageItem;

    }
}

在布局文件夹中为网格 grid_item.xml 添加自定义 View 。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/llback"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/grid_item_image"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center" >
    </ImageView>

    <TextView
        android:id="@+id/grid_item_label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:gravity="center_horizontal"
        android:textColor="@android:color/black"
        android:textSize="18sp"
        android:textStyle="bold" >
    </TextView>

</LinearLayout>

希望对你有所帮助。