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<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="@string/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/photo" />
<Button
android:id="@+id/button_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_1" />
<ImageView
android:id="@+id/photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
/>
public class MainActivity extends AppCompatActivity {
private ImageView imageView = null;
private Button bt1 = null;//图1
private Button bt2 = null;//图2
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.photo);
bt1 = (Button) findViewById(R.id.button_1);
bt1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(v==bt1){
imageView.setImageResource( R.drawable.face2);
}
}
});
bt2 = (Button) findViewById(R.id.button_2);
bt2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (v==bt2){
imageView.setImageResource( R.drawable.wanglibo);
}
}
});
}