Question

开发非常新！

我基本上想要将我在XML中创建的按钮链接到相应类中的java代码。

我想要实现的是一个放在我的网页视图上方的按钮，该按钮包含文字＆＃34;开始录制＆＃34;单击后，音频录制功能将启动，然后文本将更改为＆＃34;停止录制＆＃34;。

我遇到的问题是，我的应用程序屏幕上有一个按钮，但是，它上面没有文字，当我点击按钮时我的应用程序崩溃了。

以下是该类的代码：

public class Drugs extends AppCompatActivity {

WebView myBrowser;

private static final String LOG_TAG = "Recording";
private static String mFileName = null;


private RecordButton mRecordButton = null;
private MediaRecorder mRecorder = null;

private void onRecord(boolean start) {
    if (start) {
        startRecording();
    } else {
        stopRecording();
    }
}

private void startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setOutputFile(mFileName);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

    try {
        mRecorder.prepare();
    } catch (IOException e) {
        Log.e(LOG_TAG, "prepare() failed");
    }

    mRecorder.start();
}

private void stopRecording() {
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
}

class RecordButton extends Button {
    boolean mStartRecording = true;

    OnClickListener clicker = new OnClickListener() {
        public void onClick(View v) {
            onRecord(mStartRecording);
            if (mStartRecording) {
                setText("Stop recording");
            } else {
                setText("Start recording");
            }
            mStartRecording = !mStartRecording;
        }
    };

    public RecordButton(Context ctx) {
        super(ctx);
        setText("Start recording");
        setOnClickListener(clicker);
    }
}

public Drugs() {
    mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
    mFileName += "/audiorecordtest.3gp";
}





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

    myBrowser = (WebView) findViewById(R.id.mybrowser);
    myBrowser.loadUrl("file:///android_asset/drugs.html");
    myBrowser.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

    Button btndrugslaw = (Button) findViewById(R.id.drugslaw);

    btndrugslaw.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent intentdruglaw = new Intent(Drugs.this, DrugLaw.class);
            startActivity(intentdruglaw);
        }
    });

}

这是xml的代码

<ScrollView
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent">

<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"
tools:context="kyr.com.knowyourrights.Drugs"
android:orientation="vertical"
>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:onClick="onClick"
    >

</Button>

<WebView
    android:id="@+id/mybrowser"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
  >

</WebView>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/drugslaw"
    android:text="Take me to the law"
    android:layout_below="@id/mybrowser"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true" />

</RelativeLayout>


</ScrollView>

Answer 1

有很多方法。

例如

viewDidLoad

然后在你的班级

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:layout_above="@+id/mybrowser"
    android:layout_alignParentTop="true"
    android:onClick="recordClick"
    android:layout_centerHorizontal="true">

如果你有多个按钮

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

    myBrowser = (WebView) findViewById(R.id.mybrowser);
    myBrowser.loadUrl("file:///android_asset/drugs.html");
    myBrowser.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

    Button btndrugslaw = (Button) findViewById(R.id.drugslaw);

    btndrugslaw.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent intentdruglaw = new Intent(Drugs.this, DrugLaw.class);
            startActivity(intentdruglaw);
        }
    });

public void recordClick(View view){

    // your code to handle click
}

}

Answer 2

在XML中添加OnClick方法

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:layout_above="@+id/mybrowser"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:onClick="RecordButton"
    android:text="Start"
    >

在Java中

    Button btn = (Button) findViewById(R.id.RecordButton);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        RecordButton(v);
        }
    });


    public void RecordButton(View v) {
           Button b = (Button)v;
          if(b.getText().toString().equals("Start")){
             onRecord(true);
             b.setText("Stop");
          }else{
             onRecord(false);
             b.setText("Start");
    }

Answer 3

select all_dates.value1 as `Date`, coalesce(`Outward1(B_Qty)`,`Outward2(B_Qty)`,`Outward3(B_Qty)`, '0') as `Outward` 
from 
(select distinct C_Date as value1 from capital where P2_Goods like '750%' and Monthname(C_Date)='April'  
union all
select distinct M_Date from machine  where J_Id like '%750' and Monthname(M_Date)='April' 
union all
select distinct QC_Date from qc where QC_Name like '750%'  and Monthname(QC_Date)='April'  
) as all_dates
left join( select C_Date, sum(PR) AS `Outward1(B_Qty)` 
from capital where P2_Goods like '750%' and Monthname(C_Date)='April' group by C_Date) 
as f on f.C_Date = all_dates.value1 
left join( select M_Date, (sum(PR)+sum(C_Skip)) AS `Outward2(B_Qty)` 
from machine  where J_Id like '%750' and Monthname(M_Date)='April'  group by M_Date) 
as h on  h.M_Date = all_dates.value1 
left join( select QC_Date, sum(PR) AS `Outward3(B_Qty)` 
from qc where QC_Name like '750%' and Monthname(QC_Date)='April' group by QC_Date) 
as k on  k.QC_Date = all_dates.value1 group by all_dates.value1

实现View.OnClickLIstener

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:layout_above="@+id/mybrowser"
    android:layout_alignParentTop="true"
    android:onClick="recordClick"
    android:layout_centerHorizontal="true">

如何将xml中的按钮链接到类

3 个答案: