感谢这个网站,我弄清楚了如何在活动之间传递字符串值,但是我在传递图像时遇到了麻烦。我想要做的是让用户单击一个按钮来打开图库并允许选择图片。然后我有另一个按钮可以打开另一个显示 ImageView 的活动。我希望能够从上一个活动中选择 ImageView 的图像。
这是具有我单击以打开图库并检索所选图像的按钮的类:
public class EnterEdit extends Activity implements View.OnClickListener
{
private static final int SELECT_IMAGE = 0;
String filepath;
Bundle fieldresults;
Intent b;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.enteredit);
Button selectwallpaper = (Button) findViewById(R.id.selectwallpaper);
selectwallpaper.setOnClickListener(this);
Button previewwallpaper = (Button) findViewById(R.id.previewwallpaper);
previewwallpaper.setOnClickListener(this);
fieldresults = new Bundle();
b = new Intent(this, PreviewScreen.class);
}
@Override
public void onClick(View view)
{
switch (view.getId())
{
case R.id.selectwallpaper:
Intent gallery = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery, SELECT_IMAGE);
break;
case R.id.previewwallpaper:
startActivity(b);
}
break;
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK)
{
if (requestCode == SELECT_IMAGE)
{
Uri selectedimage = data.getData();
String[] filepathcolumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedimage, filepathcolumn, null, null, null);
cursor.moveToFirst();
int columnindex = cursor.getColumnIndex(filepathcolumn[0]);
filepath = cursor.getString(columnindex);
cursor.close();
fieldresults.putString("bitmap", filepath);
b.putExtras(fieldresults);
}
}
}
}
这是应该显示所选图像的类:
public class PreviewScreen extends Activity implements View.OnClickListener
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.previewscreen);
Bundle fieldresults = this.getIntent().getExtras();
String backgroundpath = fieldresults.getString("bitmap");
String background = BitmapFactory.decodeFile(backgroundpath);
ImageView gallerypic = (ImageView) findViewById(R.id.gallerypic);
gallerypic.setImageBitmap(background);
}
}
我不确定的是OnActivityResult
如果我应该通过selectedImage
或中选择的图像b.putExtra("bitmap", selectedimage);
线。我尝试了这两个活动,但在第二个活动中没有看到图像。我也不确定PreviewScreen
如果我正确设置图像视图,则为类。任何帮助表示赞赏。谢谢。