Question

我正在创建简单的日历应用。之前我使用Button通过.onClick事件更改月份图片。但是，当用户点击任何按钮时，通常会更改其backgroundTint。

然后我使用AppComptButton，我可以使用setSupportBackgroundTintList更改颜色。但是出现了新的问题，知道.onClick事件不起作用并且崩溃了应用程序。

activity_main.xml中：

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent">

                    <ImageView
                        android:layout_width="344dp"
                        android:layout_height="360dp"
                        android:id="@+id/imageView"
                        android:layout_alignParentTop="true"
                        android:layout_centerHorizontal="true" />

                </RelativeLayout>
            </LinearLayout>

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:id="@+id/Button_row1">

                <android.support.v7.widget.AppCompatButton
                    android:id="@+id/button1"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/imageView"
                    android:layout_alignStart="@+id/imageView"
                    android:layout_below="@+id/imageView"
                    android:layout_weight="1"
                    android:onClick="onClick"
                    android:text="Jan"
                    />

MainActivity.java ：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageView imageView;
    private Calendar calendar;
    private int currentMonth;
    private SimpleDateFormat thisMonth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        showDate();
        setColorofButton();
    }

    public void showDate(){
        calendar = Calendar.getInstance();
        imageView = (ImageView) findViewById(R.id.imageView);
        currentMonth = calendar.get(Calendar.MONTH);
        currentMonth = currentMonth + 1;
        String convert = Integer.toString(currentMonth);

        final int resID = getResources().getIdentifier("pg_000"+convert, "drawable", getPackageName());
        imageView.setImageResource(resID);

    }


    public void setColorofButton(){
        final AppCompatButton btn1 = (AppCompatButton) findViewById(R.id.button2);
        ColorStateList csl = new ColorStateList(new int[][]{new int[0]}, new int[]{0xffffcc00});
        btn1.setSupportBackgroundTintList(csl);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button1:
                updateCalander("pg_0001");
                break;

            case R.id.button2:
                updateCalander("pg_0002");
                break;

            case R.id.button3:
                updateCalander("pg_0003");
                break;

            case R.id.button4:
                updateCalander("pg_0004");
                break;

            case R.id.button5:
                updateCalander("pg_0005");
                break;

            case R.id.button6:
                updateCalander("pg_0006");
                break;

            case R.id.button7:
                updateCalander("pg_0007");
                break;

            case R.id.button8:
                updateCalander("pg_0008");
                break;

            case R.id.button9:
                updateCalander("pg_0009");
                break;

            case R.id.button10:
                updateCalander("pg_00010");
                break;

            case R.id.button11:
                updateCalander("pg_00011");
                break;

            case R.id.button12:
                updateCalander("pg_00012");
                break;
        }
    }

    public void updateCalander(String month){
        imageView = (ImageView) findViewById(R.id.imageView);
        final int resID = getResources().getIdentifier(month, "drawable", getPackageName());
        imageView.setImageResource(resID);

    }

Answer 1

在AppCompatButton（button1）里面的xml布局中，你指的是imageView，但是你在xml中声明了什么？。

Android：onClick事件无法正常运行并导致应用程序崩溃

1 个答案: