Falks，这将是一个愚蠢的错误，但我真的猜不出它在哪里。我正在尝试设置 OnTouchListener 但未调用方法 onTouch。
这是我的代码：
public class StepActivity extends SherlockActivity
{
private Recipe recipe = null;
private String TAG = "StepActivity";
private ArrayList<Step> steps;
private int caret = 0;
private int currentStep = 1;
private int stepQuantity;
private TextView viewStepBody;
private TextView stepNumber;
private ImageView viewPicture;
private String bodyText;
private String picture;
private String [] pictures = new String [5];
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.step_page);
RelativeLayout view = new RelativeLayout(this);
view.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motion) {
Log.i(TAG, "In onTouch");
float downXValue = 0;
// Get the action that was done on this touch event
switch (motion.getAction())
{
case MotionEvent.ACTION_DOWN:
{
Log.i(TAG, "In onTouch1");
// store the X value when the user's finger was pressed down
downXValue = motion.getX();
break;
}
case MotionEvent.ACTION_UP:
{
Log.i(TAG, "In onTouch2");
// Get the X value when the user released his/her finger
float currentX = motion.getX();
// going backwards: pushing stuff to the right
if (downXValue < currentX)
{
Log.i(TAG, "In onTouch previous");
goPrevious();
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
Log.i(TAG, "In onTouch next");
goNext();
}
break;
}
}
// if you return false, these actions will not be recorded
return true;
}
});
viewStepBody = (TextView)findViewById(R.id.step_body);
stepNumber = (TextView)findViewById(R.id.step_number);
viewPicture = (ImageView)findViewById(R.id.picture);
TextView recipeTitle = (TextView)findViewById(R.id.recipe_title);
try {
getSupportActionBar().setDisplayShowTitleEnabled(false);
recipe = (Recipe)getIntent().getSerializableExtra("Recipe1");
steps = recipe.getSteps();
stepQuantity = steps.size();
Log.d(TAG,"steps: " + steps.size());
if (stepQuantity > 0) {
Step step = steps.get(0);
pictures[0] = Constants.URL + step.getImg_url();
bodyText = step.getInstruction();
new DownloadImageTask().execute(pictures);
recipeTitle.setText(recipe.getTitle());
}
updateInfo();
} catch (Exception e) {
Toast.makeText(this, "Error occured" + e.getMessage(), 200);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
com.actionbarsherlock.view.MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.step_menu, (com.actionbarsherlock.view.Menu) menu);
return super.onCreateOptionsMenu(menu);
}
private void updateInfo() {
new DownloadImageTask().execute(pictures);
viewStepBody.setText(bodyText);
stepNumber.setText(currentStep + "/" + stepQuantity);
}
private void goNext() {
if (currentStep != stepQuantity) {
caret++;
currentStep++;
Step newStep = steps.get(caret);
pictures[0] = Constants.URL + newStep.getImg_url();
bodyText = newStep.getInstruction();
updateInfo();
} else {
caret = 0;
currentStep = 1;
Step newStep = steps.get(caret);
bodyText = newStep.getInstruction();
pictures[0] = Constants.URL + newStep.getImg_url();
updateInfo();
}
}
private void goPrevious() {
if (currentStep != 1) {
caret--;
currentStep--;
Step newStep = steps.get(caret);
bodyText = newStep.getInstruction();
pictures[0] = Constants.URL + newStep.getImg_url();
updateInfo();
}
else {
caret = stepQuantity - 1;
currentStep = stepQuantity;
Step newStep = steps.get(caret);
bodyText = newStep.getInstruction();
pictures[0] = Constants.URL + newStep.getImg_url();
updateInfo();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.next:
goNext();
return true;
case R.id.previous:
goPrevious();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
这是传递给 setContentView() 方法的 step_page.xml。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/step_layout1">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView android:id="@+id/recipe_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="23dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:textColor="#9d9d9d"
android:textStyle="bold"
android:layout_marginTop="4dp"/>
<TextView android:id="@+id/step_word"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dp"
android:layout_below="@+id/recipe_title"
android:textColor="#000000"
android:textStyle="bold"
android:text="@string/step_word"
android:layout_marginTop="4dp"/>
<TextView android:id="@+id/step_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dp"
android:layout_toRightOf="@+id/step_word"
android:layout_below="@+id/recipe_title"
android:textColor="#000000"
android:textStyle="bold"
android:layout_marginLeft="3dp"
android:text="1/12"
android:layout_marginTop="4dp"/>
<ImageView
android:id="@+id/picture"
android:layout_width="300dp"
android:layout_height="200dp"
android:layout_below="@+id/step_word"
android:layout_centerHorizontal="true"
/>
<TextView android:id="@+id/step_body"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="22dp"
android:textColor="#000000"
android:paddingTop="2dp"
android:layout_below="@+id/picture"
/>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
这里建议的另一种方法不起作用。：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.step_page);
RelativeLayout view = (RelativeLayout) findViewById(R.id.step_layout1);
view.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motion) {
Log.i(TAG, "In onTouch");
float downXValue = 0;
// Get the action that was done on this touch event
switch (motion.getAction())
{
case MotionEvent.ACTION_DOWN:
{
Log.i(TAG, "In onTouch1");
// store the X value when the user's finger was pressed down
downXValue = motion.getX();
break;
}
case MotionEvent.ACTION_UP:
{
Log.i(TAG, "In onTouch2");
// Get the X value when the user released his/her finger
float currentX = motion.getX();
// going backwards: pushing stuff to the right
if (downXValue < currentX)
{
Log.i(TAG, "In onTouch previous");
goPrevious();
}
// going forwards: pushing stuff to the left
if (downXValue > currentX)
{
Log.i(TAG, "In onTouch next");
goNext();
}
break;
}
}
// if you return false, these actions will not be recorded
return true;
}
});
有什么意见吗？