Question

我正在尝试构建一个文本视图，该文本视图转到onClick但它不起作用，他们告诉我添加这个代码我做了但是我有很多错误。

这是我的MainActivity.java

     package imamalsajadsayings.android.com;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.View;
    import android.widget.TextView;

    public class MainActivity extends Activity {


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

}
   public void runNextTask(){
       final View addView = getLayoutInflater().inflate(R.layout.addnewtracker, null);
       final TrackerInfo newInfo = new TrackerInfo();
       //set up for model selection
       TextView modelTextview = (TextView)addView.findViewById(R.id.state1);                    
       modelTextview.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {

           }
       });
   }


@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;
}

    }

是我的textview

        <TextView
        android:id="@+id/state1"
         android:layout_width="wrap_content"
        android:layout_height="wrap_content"
          android:text="@string/Tracker_model" 
        android:clickable="true"

注意：我没有创建addnewtracker

错误：

 Description    Resource    Path    Location    Type
TrackerInfo cannot be resolved to a type    MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 20 Java Problem
addnewtracker cannot be resolved or is not a field  MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 19 Java Problem
The method setOnClickListener(View.OnClickListener) in the type View is not applicable for the arguments (new OnClickListener(){})  MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 23 Java Problem
TrackerInfo cannot be resolved to a type    MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 20 Java Problem
The method onClick(View) of type new OnClickListener(){} must override or implement a supertype method  MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 25 Java Problem
OnClickListener cannot be resolved to a type    MainActivity.java   /ImamAlsajadsayings/src/imamalsajadsayings/android/com  line 23 Java Problem

Answer 1

添加到活动：

public void modelTextViewClick(View v) {
   //do something on click
}

和布局：

<TextView android:id="@+id/state1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/Tracker_model" 
          android:clickable="true"
          android:onClick="modelTextViewClick"/>

并删除您的on click侦听器。

Answer 2

将以下代码更改为XML文件

<TextView android:id="@+id/state1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/Tracker_model" 
      android:clickable="true"
      android:onClick="runNextTask"/>

只需修改您的java文件，如下所示。

public void runNextTask(View v){
   final View addView = getLayoutInflater().inflate(R.layout.addnewtracker, null);
   final TrackerInfo newInfo = new TrackerInfo();
   //set up for model selection
   TextView modelTextview = (TextView)addView.findViewById(R.id.state1);                    
   modelTextview.setOnClickListener(new OnClickListener() {
       @Override
       public void onClick(View v) {

       }
   });

Answer 3

您需要导入此包以避免此错误

错过了这个 - ＆gt; import android.view.View.OnClickListener;

Answer 4

您没有从 onCreate（）

runNextTask

u r使用addView方法扩展布局，但未在任何ur活动布局布局中添加该布局

这就是为什么它不起作用

应该是

package imamalsajadsayings.android.com;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.View;
    import android.widget.TextView;
    import android.view.View.OnClickListener;

    public class MainActivity extends Activity {
private LayoutInflater inflater;
private LinearLayout someLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    someLayout = (LinearLayout) findViewById(R.id.some_layout); //layout present in activity_main
    inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
    runNextTask();

}
   public void runNextTask(){
       LinearLayout mInflatedLayout = (LinearLayout) inflater.inflate(R.layout.addnewtracker, null);
       final TrackerInfo newInfo = new TrackerInfo();
       //set up for model selection
       TextView modelTextview = (TextView)mInflatedLayout.findViewById(R.id.state1); 
       someLayout.addView(mInflatedLayout);                   
       modelTextview.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View v) {

           }
       });
   }


@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;
}

    }

假设你在 activity_main 布局中使用 LinearLayout

Answer 5

使用下面的代码。

package imamalsajadsayings.android.com;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {


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

}
  public void runNextTask(){
   final View addView = getLayoutInflater().inflate(R.layout.addnewtracker, null);
   final TrackerInfo newInfo = new TrackerInfo();
   //set up for model selection
   TextView modelTextview = (TextView)addView.findViewById(R.id.state1);                    

 }


@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;
}
public void modelTextViewClick(View view)
 {
   // here view reference is your text view reference. 
   // put your on click handler code.
 }
}

此代码与您的代码之间的差异是onclick处理程序。在xml中，您已经定义了一个必须在活动代码中使用的单击处理程序。其他方式设置onclick侦听器处理程序敌人的小部件。你同时做两个都不允许在android中的任何小部件。

TextView中的setOnClickListener

5 个答案: