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android:scaleType="center" android:src="@drawable/my_image"
android:layout_width="50dp" android:layout_height="50dp" android:scaleType="fitXY" android:adjustViewBounds="true"
imageView.getLayoutParams().height = 100; // OR imageView.getLayoutParams().width = 100;
android:scaleType= center, centerCrop, centerInside.
fitCenter, fitStart, fitEnd, fitXY.
ImageView image = (ImageView) findViewById(R.id.test_image);
image.setImageResource(R.drawable.test2);
ImageView image = (ImageView) findViewById(R.id.test_image); Bitmap bMap = BitmapFactory.decodeFile("/sdcard/test2.png"); image.setImageBitmap(bMap);
// Load a bitmap from the drawable folder Bitmap bMap = BitmapFactory.decodeResource(getResources(), R.drawable.my_image); // Resize the bitmap to 150x100 (width x height) Bitmap bMapScaled = Bitmap.createScaledBitmap(bMap, 150, 100, true); // Loads the resized Bitmap into an ImageView ImageView image = (ImageView) findViewById(R.id.test_image); image.setImageBitmap(bMapScaled);
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <CheckBox android:id="@+id/checkbox_meat" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/meat" android:onClick="onCheckboxClicked"/> <CheckBox android:id="@+id/checkbox_cheese" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/cheese" android:onClick="onCheckboxClicked"/> </LinearLayout>
public void onCheckboxClicked(View view) { // Is the view now checked? boolean checked = ((CheckBox) view).isChecked(); // Check which checkbox was clicked switch(view.getId()) { case R.id.checkbox_meat: if (checked) // Put some meat on the sandwich else // Remove the meat break; case R.id.checkbox_cheese: if (checked) // Cheese me else // I‘m lactose intolerant break; } }
<?xml version="1.0" encoding="utf-8"?> <RadioGroup xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <RadioButton android:id="@+id/radio_pirates" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/pirates" android:onClick="onRadioButtonClicked"/> <RadioButton android:id="@+id/radio_ninjas" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/ninjas" android:onClick="onRadioButtonClicked"/> </RadioGroup>
public void onRadioButtonClicked(View view) { // Is the button now checked? boolean checked = ((RadioButton) view).isChecked(); // Check which radio button was clicked switch(view.getId()) { case R.id.radio_pirates: if (checked) // Pirates are the best break; case R.id.radio_ninjas: if (checked) // Ninjas rule break; } }
<Spinner android:id="@+id/mySpinner" android:layout_width="wrap_content" android:entries="@array/planets_arrays" android:prompt="@string/planets_prompt" android:layout_height="wrap_content" />
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="planets_array">
<item>Mercury</item>
<item>Venus</item>
<item>Earth</item>
<item>Mars</item>
</string-array>
</resources>
Spinner spinner = (Spinner) findViewById(R.id.spinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.planets_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
public class SpinnerActivity extends Activity implements OnItemSelectedListener {
...
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
// parent.getItemAtPosition(pos)
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
}
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原文地址：http://www.cnblogs.com/iljyya/p/4779460.html
