android - 从 gridview 中选择图像并将其显示在其他意图上

Question

我正在创建画廊。我有显示所有图像的网格布局。现在我想这样做，当我们选择一个图像时，另一个意图将启动，我已经完成了，但现在我想在这个新意图中显示选定的图像。

提前谢谢。

Answer 1

请使用下面的gridview代码。

主要的.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="fill_parent" 
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center" />

ImageAdapter.java

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

常量.java

public class Constants {
    // references to our images
    private Integer[] mThumbIds = {
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7
    };
}

MainActivity.java

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));

        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                Intentt mInDisplay=new Intent(MainActivity.this, DisplayActivity.class);
                mInDisplay.putExtra("Index", position);
                startActivity(mInDisplay);
            }
        });
    }
}

显示.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ImageView
        android:id="@+id/mImgView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>

显示活动.java

public class DisplayActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Bundle bdl=getIntent().getExtras();
        int index=bdl.getInt("Index");      
        ImageView mImage = (ImageView) findViewById(R.id.mImgView1);
        mImage.setImageResource(Constants.mThumbIds[index]);
    }
}

并将这两个活动声明到您的 android 清单文件中。

Answer 2

您可以通过setOnClickListener在每个图像上设置一个点击监听器，然后监听器可以发送启动新活动的意图。

我们还想发送带有意图的图像路径。为了实现这一点，您可以在您的意图上使用putExtra ，您选择的名称作为第一个参数，图像路径作为第二个参数。

然后，您应该能够通过在新活动中使用getStringExtra来检索图像路径。您需要通过在活动中调用 getIntent() 来获取意图

祝你好运