Question

我的目标是找到用户已选择的SeekBar金额（满分100分），并在TextView中显示此金额。这似乎是直截了当的，但由于某种原因不能用我的方法（如下所示）

public class MainActivity extends Activity {

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

        TextView textview = (TextView) findViewById(R.id.textView);
        SeekBar seekBar = (SeekBar) findViewById(R.id.seekBar);

        textview.setText(seekBar.getProgress());
    }

}

然而，应用程序崩溃（LogCat如下所示）。我已经确定错误来自这行代码

        textview.setText(seekBar.getProgress());

为什么这行代码会导致错误？我有什么办法可以做到这一点吗？

06-15 16:22:30.166: E/AndroidRuntime(24811): FATAL EXCEPTION: main
06-15 16:22:30.166: E/AndroidRuntime(24811): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sbm/com.example.sbm.MainActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x0
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2359)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread.access$700(ActivityThread.java:165)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.os.Looper.loop(Looper.java:137)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread.main(ActivityThread.java:5455)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at java.lang.reflect.Method.invokeNative(Native Method)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at java.lang.reflect.Method.invoke(Method.java:525)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at dalvik.system.NativeStart.main(Native Method)
06-15 16:22:30.166: E/AndroidRuntime(24811): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x0
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.content.res.Resources.getText(Resources.java:1068)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.widget.TextView.setText(TextView.java:4546)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at com.example.sbm.MainActivity.onCreate(MainActivity.java:19)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.Activity.performCreate(Activity.java:5372)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
06-15 16:22:30.166: E/AndroidRuntime(24811):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
06-15 16:22:30.166: E/AndroidRuntime(24811):    ... 11 more

Answer 1

你需要

textView.setText(Integer.toString(seekBar.getProgress()));

setText(int)方法期望整数参数指向String资源（例如R.string.whatever，但实际需要的是字符串表示的数字。

此外，如果您希望在用户在SeekBar上移动滑块时更改文本，则需要OnSeekBarChangedListener

Answer 2

尝试：

textview.setText(String.valueOf(seekBar.getProgress()));

由于getProgess()返回一个int值，setText()认为其资源标识符位于R.java (R.string.x)。

查找seekbar的进度

2 个答案: