可以设置“TextView”的文本。从类中“扩展视图”

Question

我在布局 xml 中插入了一个名为“disegno”的自定义视图：

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="vertical"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:background="?windowsBackground">
    <it.package.myapp.Disegno
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:id="@+id/finestraDisegno"
       android:isScrollContainer="true" />
    <FrameLayout
       android:layout_height="0dp"
       android:layout_width="0dp"
       ...
    <EditText
       ...
       android:id="@+id/et_MOD_x">
       </EditText>

然后我实现了扩展视图类来填充自定义布局：

package it.package.myapp;
import android.content.Context;
...
public class Disegno extends View {
    public Disegno(Context context) { 
            this(context, null, 0); }
    public Disegno(Context context, AttributeSet attrs) {
            this(context, attrs, 0);    
            setContentView(R.layout.main);  }
    public Disegno(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
            init(attrs);    }
    ...
    @Override
    protected void onDraw(Canvas canvas) {
            paint.setStyle(Paint.Style.FILL);
            paint.setAntiAlias(true);
            canvas.translate(mPosX, mPosY);
            canvas.scale(mScaleFactor, mScaleFactor);
            // chiamo routine assi cartesiani
            AssiCartesiani(canvas);
            // chiamo routine polilinea
            Polilinea(canvas); }
    ...

现在我将通过“findViewById(R. Id.et_MOD_x)”像这样更改代码：

@Override
protected void onDraw(Canvas canvas) {
            paint.setStyle(Paint.Style.FILL);
            paint.setAntiAlias(true);
            canvas.translate(mPosX, mPosY);
            canvas.scale(mScaleFactor, mScaleFactor);
            // chiamo routine assi cartesiani
            AssiCartesiani(canvas);
            // chiamo routine polilinea
            Polilinea(canvas);

            EditText et_MOD_x = (EditText) findViewById(R.Id.et_MOD_x)
            et_MOD_x.setText("abcd");

            }

但没有“setContentView(...)”是不可能的！ 总结：我想从“扩展视图”类中设置“EditText”的文本。我想指出一个外部布局......嗯！ 有什么办法可以做到这一点吗？！

Answer 1

自定义视图中有一个引用

public class Disegno extends View {
    private TextView textView;

    public void setTextView(TextView tv){
        textview = tv;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        textview.setText("Your text here!") 
    }

}

在 Activity.onCreate() 的

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

    EditText et_MOD_x = (EditText) findViewById(R.Id.et_MOD_x);
    Disegno finestraDisegno = (Disegno)findViewById(R.Id.finestraDisegno);
    finestraDisegno.setTextView(et_MOD_x) ;


}

Answer 2

可能这不是正确的方法，但您可以：

Get your editText in your activity and declare it as static.

public static EditText et_MOD_x;
et_MOD_x = (EditText) findViewById(R.Id.et_MOD_x)

并在您的 View 类中设置文本：

YourActivity.et_MOD_x.setText("abcd");

希望它有帮助..