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我试图让我的第一个应用程序（yahtzee）。当你点击滚动按钮时，我想切换骰子的图像，现在每当我调用setImageResource时，我都会崩溃。setImageResource崩溃应用程序
主要活动：
public class MainActivity extends ActionBarActivity {
Button button;
ImageView image1;
ImageView image2;
ImageView image3;
ImageView image4;
ImageView image5;
TextView hold1;
TextView hold2;
TextView hold3;
TextView hold4;
TextView hold5;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image1 = (ImageView) findViewById(R.id.dice1);
image2 = (ImageView) findViewById(R.id.dice2);
image3 = (ImageView) findViewById(R.id.dice3);
image4 = (ImageView) findViewById(R.id.dice4);
image5 = (ImageView) findViewById(R.id.dice5);
button = (Button) findViewById(R.id.Roll);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
public void rollDice(View view) {
Random rand = new Random();
int r1, r2, r3, r4, r5;
r1 = rand.nextInt(5) + 1;
r2 = rand.nextInt(5) + 1;
r3 = rand.nextInt(5) + 1;
r4 = rand.nextInt(5) + 1;
r5 = rand.nextInt(5) + 1;
//image1.setImageDrawable(getResources().getDrawable(R.drawable.die2));
image1.setImageResource(R.drawable.die2);
/*
if (hold1.getVisibility() == 0)
{
if (r1 == 1)
image1.setImageResource(R.drawable.die1);
else if (r1 == 2)
image1.setImageResource(R.drawable.die2);
else if (r1 == 3)
//image1.setImageResource(R.drawable.die3);
else if (r1 == 4)
image1.setImageResource(R.drawable.die4);
else
image1.setImageResource(R.drawable.die5);
}
if (hold2.getVisibility() == 0)
{
if (r2 == 1)
image2.setImageResource(R.drawable.die1);
else if (r2 == 2)
image2.setImageResource(R.drawable.die2);
else if (r2 == 3)
image2.setImageResource(R.drawable.die3);
else if (r2 == 4)
image2.setImageResource(R.drawable.die4);
else
image2.setImageResource(R.drawable.die5);
}
if (hold3.getVisibility() == 0)
{
if (r3 == 1)
image3.setImageResource(R.drawable.die1);
else if (r3 == 2)
image3.setImageResource(R.drawable.die2);
else if (r3 == 3)
image3.setImageResource(R.drawable.die3);
else if (r3 == 4)
image3.setImageResource(R.drawable.die4);
else
image3.setImageResource(R.drawable.die5);
}
if (hold4.getVisibility() == 0)
{
if (r4 == 1)
image4.setImageResource(R.drawable.die1);
else if (r4 == 2)
image4.setImageResource(R.drawable.die2);
else if (r4 == 3)
image4.setImageResource(R.drawable.die3);
else if (r4 == 4)
image4.setImageResource(R.drawable.die4);
else
image4.setImageResource(R.drawable.die5);
}
if (hold5.getVisibility() == 0)
{
if (r5 == 1)
image5.setImageResource(R.drawable.die1);
else if (r5 == 2)
image5.setImageResource(R.drawable.die2);
else if (r5 == 3)
image5.setImageResource(R.drawable.die3);
else if (r5 == 4)
image5.setImageResource(R.drawable.die4);
else
image5.setImageResource(R.drawable.die5);
}
*/
}
}
片段main.xml中：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.yahtz.MainActivity$PlaceholderFragment" >
<Button
android:id="@+id/Roll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Roll"
android:onClick="rollDice" />
<ImageView
android:id="@+id/dice1"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_above="@+id/Roll"
android:layout_marginBottom="10dp"
android:layout_marginLeft="0dp"
android:clickable="true"
android:src="@drawable/die1" />
<ImageView
android:id="@+id/dice2"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_above="@+id/Roll"
android:layout_marginBottom="10dp"
android:layout_marginLeft="60dp"
android:clickable="true"
android:src="@drawable/die2" />
<ImageView
android:id="@+id/dice3"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_above="@+id/Roll"
android:layout_marginBottom="10dp"
android:layout_marginLeft="120dp"
android:clickable="true"
android:src="@drawable/die3" />
<ImageView
android:id="@+id/dice4"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_above="@+id/Roll"
android:layout_marginBottom="10dp"
android:layout_marginLeft="180dp"
android:clickable="true"
android:src="@drawable/die4" />
<ImageView
android:id="@+id/dice5"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_above="@+id/Roll"
android:layout_marginBottom="10dp"
android:layout_marginLeft="240dp"
android:clickable="true"
android:src="@drawable/die5" />
<TextView
android:id="@+id/hold1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/Roll"
android:layout_marginBottom="70dp"
android:layout_marginLeft="10dp"
android:visibility="invisible"
android:text="Hold"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/hold2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/Roll"
android:layout_marginBottom="70dp"
android:layout_marginLeft="70dp"
android:visibility="invisible"
android:text="Hold"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/hold3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/Roll"
android:layout_marginBottom="70dp"
android:layout_marginLeft="130dp"
android:visibility="invisible"
android:text="Hold"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/hold4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/Roll"
android:layout_marginBottom="70dp"
android:layout_marginLeft="190dp"
android:visibility="invisible"
android:text="Hold"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/hold5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/Roll"
android:layout_marginBottom="70dp"
android:layout_marginLeft="250dp"
android:visibility="invisible"
android:text="Hold"
android:textAppearance="?android:attr/textAppearanceSmall" />
logcat的 i.stack.imgur.com/n3R2k.png
请编辑的问题，包括它的堆栈跟踪。尽量避免代码和堆栈跟踪图片。 – Emmanuel
当你调用'setContentView（R.layout.activity_main）'时，你所有的UI都是'null'，因为它们在'fragment_main'中。看[这里]（http://stackoverflow.com/questions/23820314/android-text-view-giving-an-error-when-trying-to-set-text/23820638#23820638）在哪里考虑类似的问题。 – Onik