在我的应用程序中，我有一个 imageView，它从用户那里收集图片，保存它，然后应该将该图像设置为我其他活动的背景。我不知道使用以下代码在我的活动中将图像设置为背景的位置：
Drawable d = new BitmapDrawable(getResources(),bitmap);
yourBackgroundView.setBackground(d);
这是编码：Drag_and_Drop_App.java：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class Drag_and_Drop_App extends Activity {
private ListView mListAppInfo;
// Search EditText
EditText inputSearch;
public static AppInfoAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set layout for the main screen
setContentView(R.layout.drag_and_drop_app);
// import buttons
Button btnLinkToFeedback = (Button) findViewById(R.id.btnLinkToFeedback);
Button btnLinkToPersonalize = (Button) findViewById(R.id.btnLinkToPersonalize);
// Link to Feedback Screen
btnLinkToFeedback.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
Feedback.class);
startActivity(i);
finish();
}
});
// Link to Personalize Screen
btnLinkToPersonalize.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(),
Personalize.class);
startActivity(i);
finish();
}
});
// create new adapter
adapter = new AppInfoAdapter(this, (List<ApplicationInfo>) Utilities.getInstalledApplication(this), getPackageManager());
// load list application
mListAppInfo = (ListView)findViewById(R.id.lvApps);
// set adapter to list view
mListAppInfo.setAdapter(adapter);
// search bar
inputSearch = (EditText) findViewById(R.id.inputSearch);
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
// Drag_and_Drop_App.this.adapter.getFilter().filter(cs);
if (Drag_and_Drop_App.this.adapter == null){
// some print statement saying it is null
Log.d ("msg_error", "adapter_is_null");
}
Drag_and_Drop_App.this.adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
// implement event when an item on list view is selected
mListAppInfo.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {
// get the list adapter
AppInfoAdapter appInfoAdapter = (AppInfoAdapter)parent.getAdapter();
// get selected item on the list
ApplicationInfo appInfo = (ApplicationInfo)appInfoAdapter.getItem(pos);
// launch the selected application
Utilities.launchApp(parent.getContext(), getPackageManager(), appInfo.packageName);
}
});
// implement event when an item on list view is selected via long-click for drag and drop
mListAppInfo.setOnItemLongClickListener(new OnItemLongClickListener(){
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int pos, long id) {
// TODO Auto-generated method stub
// get the list adapter
AppInfoAdapter appInfoAdapter = (AppInfoAdapter)parent.getAdapter();
// get selected item on the list
ApplicationInfo appInfo = (ApplicationInfo)appInfoAdapter.getItem(pos);
// launch the selected application
Utilities.launchApp(parent.getContext(), getPackageManager(), appInfo.packageName);
return true;
}
});
}
// load image from imageview
public Bitmap getThumbnail(String filename) {
Bitmap thumbnail = null;
try {
File filePath = this.getFileStreamPath(filename);
FileInputStream fi = new FileInputStream(filePath);
thumbnail = BitmapFactory.decodeStream(fi);
} catch (Exception ex) {
Log.e("getThumbnail() on internal storage", ex.getMessage());
}
return thumbnail;
}
}
添加编码：
RelativeLayout yourBackgroundView = (RelativeLayout) findViewById(R.layout.drag_and_drop_app);
yourBackgroundView = backgroundReference.get();
Drawable d = new BitmapDrawable(getResources(),bitmap);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN){
yourBackgroundView.setBackgroundDrawable(d);
} else {
yourBackgroundView.setBackground(d);
}
当前相关的课程：
个性化.java：
package com.example.awesomefilebuilderwidget;
IMPORTS
public class Personalize extends Activity implements OnClickListener {
Button button;
ImageView image;
ImageView image2;
Button btnChangeImage;
Button btnChangeImageForIcon;
private static final int SELECT_PICTURE = 1;
private static final int SELECT_PICTURE_2 = 2;
private String selectedImagePath;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.personalize);
image = (ImageView) findViewById(R.id.imageView1);
image2 = (ImageView) findViewById(R.id.imageView2Icon);
Button btnChangeImage = (Button) findViewById(R.id.btnChangeImage);
btnChangeImage.setOnClickListener(this);
Button btnChangeImageForIcon = (Button) findViewById(R.id.btnChangeImageForIcon);
btnChangeImageForIcon.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, SELECT_PICTURE);
};
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE)
{
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b1 = getAndDecodeImage(selectedImagePath);
if(b1 != null){
image.setImageBitmap(b1);
}
} else if (requestCode == SELECT_PICTURE_2)
{
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
Bitmap b2 = getAndDecodeImage(selectedImagePath);
if(b2 != null){
image2.setImageBitmap(b2);
}
}
}
}
private Bitmap getAndDecodeImage(String selectedImagePath){
try {
FileInputStream fileis=new FileInputStream(selectedImagePath);
BufferedInputStream bufferedstream=new BufferedInputStream(fileis);
byte[] bMapArray= new byte[bufferedstream.available()];
bufferedstream.read(bMapArray);
Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
if (fileis != null)
{
fileis.close();
}
if (bufferedstream != null)
{
bufferedstream.close();
}
return bMap;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public boolean saveImageToInternalStorage(Bitmap image) { try { FileOutputStream fos = this.openFileOutput("desiredFilename.png", Context.MODE_PRIVATE); image.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close();
返回真；} 捕捉（异常 e）{ 返回错误；} } }