我在android-project的2个类中有相同的代码。我刚刚开始学习java / android,所以请你给我一些提示吗?我是否设置了新课程?谢谢你的帮助!
Main.java
public class Main extends Activity {
private static int RESULT_LOAD_IMAGE = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnGallery = (Button) findViewById(R.id.btnGallery);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
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]);
String picturePath = cursor.getString(columnIndex);
Intent uploadActivity = new Intent(Main.this, Upload.class);
uploadActivity.putExtra("picturePath", picturePath);
startActivity(uploadActivity);
cursor.close();
}
}
}
和Upload.java
public class Upload extends Activity {
private static int RESULT_LOAD_IMAGE = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
Bundle extras = getIntent().getExtras();
String picturePathView = extras.getString("picturePath");
ImageView imageView = (ImageView) findViewById(R.id.imgView);
findViewById(R.id.imgView).setScrollBarStyle(
View.SCROLLBARS_INSIDE_INSET);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePathView));
Button btnGallery = (Button) findViewById(R.id.btnGallery);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
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]);
String picturePath = cursor.getString(columnIndex);
ImageView imageView = (ImageView) findViewById(R.id.imgView);
findViewById(R.id.imgView).setScrollBarStyle(
View.SCROLLBARS_INSIDE_INSET);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
cursor.close();
}
}
}
答案 0 :(得分:1)
这实际上是hasanghaforian所说的,但更为正确。
您启用的抽象活动包含与上传和主要相同的属性,可以是以下
public abstract class AbstractMediaPickerActivity extends Activity {
protected static int RESULT_LOAD_IMAGE = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
protected void startMediaPicker() {
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
protected abstract void onImagePicked(String picturePath);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
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]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
onImagePicked(picturePath);
}
}
}
您的其他两个类都由AbstractMediaPickerActivity
继承public class MainActivity extends AbstractMediaPickerActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnGallery = (Button) findViewById(R.id.btnGallery);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
startMediaPicker();
}
});
}
protected void onImagePicked(String picturePath) {
Intent uploadActivity = new Intent(Main.this, Upload.class);
uploadActivity.putExtra("picturePath", picturePath);
startActivity(uploadActivity);
}
}
public class Upload extends AbstractMediaPickerActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
Bundle extras = getIntent().getExtras();
String picturePathView = extras.getString("picturePath");
ImageView imageView = (ImageView) findViewById(R.id.imgView);
findViewById(R.id.imgView).setScrollBarStyle(
View.SCROLLBARS_INSIDE_INSET);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePathView));
Button btnGallery = (Button) findViewById(R.id.btnGallery);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
startMediaPicker();
}
});
}
@Override
protected void onImagePicked(String picturePath) {
ImageView imageView = (ImageView) findViewById(R.id.imgView);
findViewById(R.id.imgView).setScrollBarStyle(
View.SCROLLBARS_INSIDE_INSET);
imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
}
}
答案 1 :(得分:0)
创建一个类(例如SuperActivity),扩展Activity并向其添加重复的代码。然后创建扩展SuperActivity的活动A,B。
答案 2 :(得分:0)
当然,您可以将所有代码放在一个类中。我不会编写所有代码,但您会了解如何在代码中获得重构。
对于onClickListner
,您可以执行以下操作:
@Override
public void onClick(View clickedView) {
int clickedViewId = clickedView.getId();
switch(clickedViewId) {
case R.id.firstItem:
// code when first view is clicked
case R.id.secondItem:
// code when second view is clicked
default:
// optional
}
}
然后为两个视图设置相同的onClickListner
。
您可以在onActivityResult
方法中使用相同类型的switch语句。我希望你现在可以合并这两个类。