android - 为什么 Intent 在 AlertDialog.Builder 之前启动，即使它的编码方式相反

Question

如下代码，在调用newPicture时启动Intent，之后显示Dialog。这是什么意思，我该如何更改顺序？

public void newPicture(View v) {
    SharedPreferences settings = getPreferences(MODE_PRIVATE);
    boolean geoProtipAlreadyShown = settings.getBoolean("geoProtipAlreadyShown", false);

    if (!geoProtipAlreadyShown) {
        showGeoProtip();

        // and set the option in SharedPreferences
        SharedPreferences.Editor editor = settings.edit();
        editor.putBoolean("geoProtipAlreadyShown", true);
        editor.commit();
    }

    // start the image capture activity
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);        
    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(PATH, "tmpfile.jpg")));
    startActivityForResult(intent, IMAGE_CAPTURE);  

}

private void showGeoProtip() {
    String geoProtip = this.getResources().getString(R.string.protip);
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage(geoProtip).setCancelable(true).setPositiveButton("OK", null);
    AlertDialog alert = builder.create();
    alert.show();
}

Answer 1

将启动图像捕获 Activity 移动到新方法，并将其放入对话框的 OnClickListener:

builder.setMessage(geoProtip).setCancelable(true).setPositiveButton("OK",
    new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            captureImage();
        }
    });


private void captureImage(){
        // start the image capture activity
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);        
        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(PATH, "tmpfile.jpg")));
        startActivityForResult(intent, IMAGE_CAPTURE);        
}

并修改if-else:

if (!geoProtipAlreadyShown) {
    showGeoProtip();
    ....
}else{
    captureImage();
}