我有一个 imageView，其中的图像是从 url 加载的。单击图像时，我想在另一个包含自定义 View 的 Activity 中显示图像。当我点击图像时出现错误并且 Activity 崩溃。
Main2Activity
public class Main2Activity extends AppCompatActivity {
ImageView imageView;
ImageLoader imgLoader;
String strURL = "http://static.ddmcdn.com/gif/cats-250-250.jpg";
// URI uri = null;
// URL url = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
imageView = (ImageView) findViewById(R.id.imageView2);
imgLoader = new ImageLoader(this);
imgLoader.DisplayImage(strURL, imageView);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(Main2Activity.this, MemeCreateActivity.class);
i.putExtra(MemeCreateActivity.EXTRA_IMAGE_PATH, strURL);
startActivity(i);
}
});
}
}
MemeCreateActivity
public class MemeCreateActivity extends AppCompatActivity
implements MemeSetting.OnMemeSettingChangedListener<Typeface, Bitmap>,
BottomSheetLayout.OnSheetStateChangeListener, OnSheetDismissedListener {
//########################
//## Static
//########################
public final static int RESULT_MEME_EDITING_FINISHED = 150;
public final static int RESULT_MEME_EDIT_SAVED = 1;
public final static int RESULT_MEME_NOT_SAVED = 0;
public final static String EXTRA_IMAGE_PATH = "extraImage";
public final static String ASSET_IMAGE = "assetImage";
//########################
//## UI Binding
//########################
@BindView(R.id.fab)
FloatingActionButton fab;
@BindView(R.id.toolbar)
Toolbar toolbar;
@BindView(R.id.memecreate__activity__bottomsheet_layout)
BottomSheetLayout bottomSheet;
@BindView(R.id.memecreate__activity__image)
ImageView imageEditView;
@BindView(R.id.memecreate__activity__edit_caption_bottom)
EditText textEditBottomCaption;
@BindView(R.id.memecreate__activity__edit_caption_top)
EditText textEditTopCaption;
//#####################
//## Members
//#####################
private static boolean doubleBackToExitPressedOnce = false;
private Bitmap lastBitmap = null;
private long memeSavetime = -1;
private App app;
private MemeSetting<Typeface, Bitmap> memeSetting;
private boolean bFullscreenImage = true;
//#####################
//## Methods
//#####################
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.memecreate__activity);
// Quit activity if no image was given
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if (!(Intent.ACTION_SEND.equals(action) && type.startsWith("image/")) &&
(!getIntent().hasExtra(EXTRA_IMAGE_PATH) || !getIntent().hasExtra(ASSET_IMAGE))) {
finish();
return;
}
// Bind Ui
ButterKnife.bind(this);
app = (App) getApplication();
// Set toolbar
setSupportActionBar(toolbar);
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
Bitmap bitmap = extractBitmapFromIntent(intent);
memeSetting = new MemeSetting<>(app.getFonts().get(app.settings.getLastSelectedFont()), bitmap);
memeSetting.setDisplayImage(memeSetting.getImage().copy(Bitmap.Config.RGB_565, false));
memeSetting.setFontId(app.settings.getLastSelectedFont());
textEditTopCaption.setText(memeSetting.getCaptionTop());
textEditBottomCaption.setText(memeSetting.getCaptionBottom());
memeSetting.setMemeSettingChangedListener(this);
memeSetting.notifyChangedListener();
}
@Override
protected void onDestroy() {
imageEditView.setImageBitmap(null);
if (lastBitmap != null && !lastBitmap.isRecycled())
lastBitmap.recycle();
if (!memeSetting.getImage().isRecycled())
memeSetting.getImage().recycle();
if (!memeSetting.getDisplayImage().isRecycled())
memeSetting.getDisplayImage().recycle();
super.onDestroy();
}
@Override
protected void onResume() {
super.onResume();
if (bFullscreenImage) {
bFullscreenImage = false;
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}
}
private Bitmap extractBitmapFromIntent(final Intent intent) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bitmap = null;
String imagePath = getIntent().getStringExtra(EXTRA_IMAGE_PATH);
App.log("imagepath::" + imagePath);
if (intent.getAction() != null && intent.getAction().equals(Intent.ACTION_SEND) && intent.getType().startsWith("image/")) {
Uri imageURI = intent.getParcelableExtra(Intent.EXTRA_STREAM);
if (imageURI != null) {
try {
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), imageURI);
} catch (IOException e) {
bitmap = null;
e.printStackTrace();
}
}
} else if (intent.getBooleanExtra(ASSET_IMAGE, false)) {
try {
//Scale big images down to avoid "out of memory"
InputStream inputStream = getAssets().open(imagePath);
BitmapFactory.decodeStream(inputStream, new Rect(0, 0, 0, 0), options);
options.inSampleSize = Helpers.calculateInSampleSize(options, app.settings.getRenderQuality());
options.inJustDecodeBounds = false;
inputStream.close();
inputStream = getAssets().open(imagePath);
bitmap = BitmapFactory.decodeStream(inputStream, new Rect(0, 0, 0, 0), options);
} catch (IOException e) {
bitmap = null;
e.printStackTrace();
}
} else {
//Scale big images down to avoid "out of memory"
BitmapFactory.decodeFile(imagePath, options);
options.inSampleSize = Helpers.calculateInSampleSize(options, app.settings.getRenderQuality());
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(imagePath, options);
}
return bitmap;
}
@Override
public void onBackPressed() {
if (bottomSheet.isSheetShowing()) {
bottomSheet.dismissSheet();
return;
}
if (doubleBackToExitPressedOnce) {
super.onBackPressed();
return;
}
doubleBackToExitPressedOnce = true;
Snackbar.make(findViewById(android.R.id.content), R.string.creator__press_back_again_to_exit, Snackbar.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
doubleBackToExitPressedOnce = false;
}
}, 2000);
}
@OnClick(R.id.memecreate__activity__image)
public void onImageClicked(View view) {
Helpers.hideSoftKeyboard(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.creatememe__menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_share: {
app.shareBitmapToOtherApp(lastBitmap, this);
return true;
}
case R.id.action_save: {
saveMemeToFilesystem();
return true;
}
}
return super.onOptionsItemSelected(item);
}
private void saveMemeToFilesystem() {
String filepath = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), getString(R.string.app_name)).getAbsolutePath();
String thumbnailPath = new File(filepath, getString(R.string.dot_thumbnails)).getAbsolutePath();
if (memeSavetime < 0) {
memeSavetime = System.currentTimeMillis();
}
String filename = String.format(Locale.getDefault(), "%s_%d.jpg", getString(R.string.app_name), memeSavetime);
if (Helpers.saveBitmapToFile(filepath, filename, lastBitmap) != null && Helpers.saveBitmapToFile(thumbnailPath, filename, Helpers.createThumbnail(lastBitmap)) != null) {
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle(R.string.creator__saved_successfully)
.setMessage(R.string.creator__saved_successfully_message)
.setNegativeButton(android.R.string.no, null)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
dialog.show();
}
}
@OnClick(R.id.fab)
public void onFloatingButtonClicked(View view) {
fab.setVisibility(View.INVISIBLE);
bottomSheet.showWithSheetView(((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).
inflate(R.layout.memecreate__bottom_sheet, bottomSheet, false));
bottomSheet.addOnSheetStateChangeListener(this);
bottomSheet.addOnSheetDismissedListener(this);
LineColorPicker colorPickerShade = ButterKnife.findById(this, R.id.memecreate__bottom_sheet__color_picker_for_border);
LineColorPicker colorPickerText = ButterKnife.findById(this, R.id.memecreate__bottom_sheet__color_picker_for_text);
Spinner dropdownFont = ButterKnife.findById(this, R.id.memecreate__bottom_sheet__dropdown_font);
SeekBar seekFontSize = ButterKnife.findById(this, R.id.memecreate__bottom_sheet__seek_font_size);
ToggleButton toggleAllCaps = ButterKnife.findById(this, R.id.memecreate__bottom_sheet__toggle_all_caps);
colorPickerText.setColors(MemeLibConfig.MEME_COLORS.ALL);
colorPickerShade.setColors(MemeLibConfig.MEME_COLORS.ALL);
FontAdapter adapter = new FontAdapter(
this, android.R.layout.simple_list_item_1, app.getFonts());
dropdownFont.setAdapter(adapter);
// Apply existing settings
colorPickerText.setSelectedColor(memeSetting.getTextColor());
colorPickerShade.setSelectedColor(memeSetting.getBorderColor());
dropdownFont.setSelection(memeSetting.getFontId());
toggleAllCaps.setChecked(memeSetting.isAllCaps());
((SeekBar) ButterKnife.findById(this, R.id.memecreate__bottom_sheet__seek_font_size)).setProgress(memeSetting.getFontSize() - MemeLibConfig.FONT_SIZES.MIN);
//
// Add bottom sheet listeners
//
colorPickerShade.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
LineColorPicker picker = (LineColorPicker) v;
memeSetting.setBorderColor(picker.getColor());
}
});
colorPickerText.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
LineColorPicker picker = (LineColorPicker) v;
memeSetting.setTextColor(picker.getColor());
}
});
dropdownFont.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onNothingSelected(AdapterView<?> parent) {
}
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
memeSetting.setFont((MemeFont<Typeface>) parent.getSelectedItem());
memeSetting.setFontId(parent.getSelectedItemPosition());
app.settings.setLastSelectedFont(memeSetting.getFontId());
}
});
seekFontSize.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onStartTrackingTouch(SeekBar seekBar) {
}
public void onStopTrackingTouch(SeekBar seekBar) {
}
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
memeSetting.setFontSize(progress + MemeLibConfig.FONT_SIZES.MIN);
}
});
toggleAllCaps.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
memeSetting.setAllCaps(isChecked);
}
});
}
public Bitmap drawMultilineTextToBitmap(Context c, MemeSetting<Typeface, Bitmap> memeSetting) {
// prepare canvas
Resources resources = c.getResources();
Bitmap bitmap = memeSetting.getDisplayImage();
float scale = Helpers.getScalingFactor(bitmap.getWidth(), bitmap.getHeight());
float borderScale = scale * memeSetting.getFontSize() / MemeLibConfig.FONT_SIZES.DEFAULT;
Bitmap.Config bitmapConfig = bitmap.getConfig();
// set default bitmap config if none
if (bitmapConfig == null) {
bitmapConfig = Bitmap.Config.RGB_565;
}
// resource bitmaps are immutable,
// so we need to convert it to mutable one
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
// new antialiased Paint
TextPaint paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
paint.setTextSize((int) (memeSetting.getFontSize() * scale));
paint.setTypeface(memeSetting.getFont().getFont());
//paint.setStrokeWidth(memeSetting.getFontSize() / 4);
paint.setStrokeWidth(borderScale);
String[] textStrings = {memeSetting.getCaptionTop(), memeSetting.getCaptionBottom()};
if (memeSetting.isAllCaps()) {
for (int i = 0; i < textStrings.length; i++) {
textStrings[i] = textStrings[i].toUpperCase();
}
}
for (int i = 0; i < textStrings.length; i++) {
paint.setColor(memeSetting.getBorderColor());
paint.setStyle(Paint.Style.FILL_AND_STROKE);
// set text width to canvas width minus 16dp padding
int textWidth = canvas.getWidth() - (int) (16 * scale);
// init StaticLayout for text
StaticLayout textLayout = new StaticLayout(
textStrings[i], paint, textWidth, Layout.Alignment.ALIGN_CENTER, 1.0f, 0.0f, false);
// get height of multiline text
int textHeight = textLayout.getHeight();
// get position of text's top left corner center: (bitmap.getWidth() - textWidth)/2
float x = (bitmap.getWidth() - textWidth) / 2;
float y = 0;
if (i == 0)
y = bitmap.getHeight() / 15;
else
y = bitmap.getHeight() - textHeight;
// draw text to the Canvas center
canvas.save();
canvas.translate(x, y);
textLayout.draw(canvas);
// new antialiased Paint
paint.setColor(memeSetting.getTextColor());
paint.setStyle(Paint.Style.FILL);
// init StaticLayout for text
textLayout = new StaticLayout(
textStrings[i], paint, textWidth, Layout.Alignment.ALIGN_CENTER, 1.0f, 0.0f, false);
// get height of multiline text
textHeight = textLayout.getHeight();
// draw text to the Canvas center
textLayout.draw(canvas);
canvas.restore();
}
return bitmap;
}
@OnTextChanged(value = R.id.memecreate__activity__edit_caption_bottom, callback = OnTextChanged.Callback.TEXT_CHANGED)
public void onCaptionBottomChanged(CharSequence text) {
memeSetting.setCaptionBottom(text.toString());
}
@OnTextChanged(value = R.id.memecreate__activity__edit_caption_top, callback = OnTextChanged.Callback.TEXT_CHANGED)
public void onCaptionTopChanged(CharSequence text) {
memeSetting.setCaptionTop(text.toString());
}
@Override
public void onMemeSettingChanged(MemeSetting<Typeface, Bitmap> memeSetting) {
imageEditView.setImageBitmap(null);
if (lastBitmap != null)
lastBitmap.recycle();
Bitmap bmp = drawMultilineTextToBitmap(this, memeSetting);
imageEditView.setImageBitmap(bmp);
lastBitmap = bmp;
}
@Override
public void onSheetStateChanged(BottomSheetLayout.State state) {
if (state == BottomSheetLayout.State.HIDDEN) {
fab.setVisibility(View.VISIBLE);
textEditBottomCaption.setVisibility(View.VISIBLE);
textEditTopCaption.setVisibility(View.VISIBLE);
}
if (state == BottomSheetLayout.State.EXPANDED || state == BottomSheetLayout.State.PEEKED) {
textEditBottomCaption.setVisibility(View.GONE);
textEditTopCaption.setVisibility(View.GONE);
}
}
@Override
public void onDismissed(BottomSheetLayout bottomSheetLayout) {
fab.setVisibility(View.VISIBLE);
}
}
我在 logcat 中收到以下错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.github.gsantner.memetastic, PID: 18271
java.lang.RuntimeException: Unable to destroy activity {io.github.gsantner.memetastic/io.github.gsantner.memetastic.activity.MemeCreateActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3497)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5021)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at io.github.gsantner.memetastic.activity.MemeCreateActivity.onDestroy(MemeCreateActivity.java:150)
at android.app.Activity.performDestroy(Activity.java:5403)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1120)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3484)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5021)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
at dalvik.system.NativeStart.main(Native Method)
最佳答案
问题是你调用了两次 getIntent 但实际上它应该只接收一次 intent
因此，在您的第二个 Activity 方法 onCreate 中，删除这些行
if (!(Intent.ACTION_SEND.equals(action) && type.startsWith("image/")) && (!getIntent().hasExtra(EXTRA_IMAGE_PATH) || !getIntent().hasExtra(ASSET_IMAGE))) { finish(); return; }
然后添加这些行
Intent i = getIntent();
if (!(Intent.ACTION_SEND.equals(action) && type.startsWith("image/")) && (!i.hasExtra(EXTRA_IMAGE_PATH) || !i.hasExtra(ASSET_IMAGE))) { finish(); return; }
关于android - 在图像上单击在另一个 Activity 中打开图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42817774/