0

我有一个应用程序使用共享首选项从一些预先确定的图像中设置背景，但我想让用户能够从他们的图库中选择图像。我怎样才能做到这一点？

下面的代码：

int bak;
int em;
int lo;
int lay;
SharedPreferences data;
public static String filename = "bg";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    lo = R.layout.main;
    data = getSharedPreferences(filename, 0);
    lay = data.getInt("lout", lo);          
    setContentView(lay);

    em = R.drawable.bakgrund;
    data = getSharedPreferences(filename, 0);
    bak = data.getInt("bakgrund", em);

}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    RelativeLayout bg = (RelativeLayout) findViewById(R.id.might);
    bg.setBackgroundResource(bak);
4

1 回答 1

2

在 onCreate 方法中添加这些行以从您的图库中选择图像：

Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"),0);

并在 onCreate 下方添加此方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case 0:
            data.getDataString()
            if (resultCode == RESULT_OK) {
                try {
                    Bitmap bitmap = MediaStore.Images.Media.getBitmap(_activity.getContentResolver(), data.getDataString());
                    RelativeLayout bg = (RelativeLayout) findViewById(R.id.might);
                    Drawable drawable = new BitmapDrawable(getResources(), bitmap);
                    bg.setBackgroundDrawable(drawable);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                break;
            }
    }
}

此外，在清单文件中添加此权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
于 2012-04-08T15:25:36.450 回答