标签: android-custom-view

我有一个包含 4-5 个子视图的 RelativeLayout 的 xml 布局。我想有一个基于此 xml 布局的自定义 View 类和一个自定义的 onclick 监听器。

我尝试通过扩展 RelativeLayout 并将视图作为成员来使用自定义类。在我的构造函数中，我正在膨胀布局并将其分配给我的 View 成员。但我想让类本身类似于我膨胀的视图对象。（我说的有道理吗！！）

我当前的代码类似于以下内容：

public class CustomItemView extends RelativeLayout {
  private Context context;
  private View itemView;

  public CustomItemView(Context context) {
    super(context);
    this.context = context;

     LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

      itemView = inflater.inflate(layout, null);                
  }

  public View getView() {
    return itemView;
  }       
}

我需要用我的标签自定义视图,问题是FILL_PARENT不工作(如看到这里).

所以我需要使用margin和stuff,但是为了让视图在所有配置(横向/纵向,或平板电脑的高度都会改变)的选项卡中居中,这样做有点棘手.

我不知道在每个配置上使用什么值.另外,我没有找到系统用来开始的默认布局.

在我的自定义视图中，用户可以绘制一些路径，然后将这些路径与背景位图合并，并将所有内容保存在 .JPG 文件中。问题是：如果我将位图缩放 2 倍，如何对路径进行相同的缩放？

谢谢你。

我正在尝试实现自定义列表视图.它显示很好,当我慢慢滚动它时它正常工作.但是,当我开始更快地滚动时,应用程序崩溃了.下面是我的列表视图适配器的代码.

import java.util.List;

import MainActivity.ListViewItem;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class CustomListViewAdapter extends BaseAdapter {

LayoutInflater inflater;
List<ListViewItem> items;

public CustomListViewAdapter(Activity context, List<ListViewItem> items) {
    super();

    this.items = items;
    this.inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return items.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int …

我正在尝试创建一个与常规WebView完全相同的自定义WebView,除了它有圆角.圆角需要透明,因为我想将此WebView放在对话框中.

我尝试制作我的自定义类:

public class RoundedWebView extends WebView
{
    private Context context;

    private int width;

    private int height;

    public RoundedWebView(Context context)
    {
        super(context);

        initialize(context);
    }

    public RoundedWebView(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        initialize(context);
    }

    public RoundedWebView(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);

        initialize(context);
    }

    private void initialize(Context context)
    {
        this.context = context;
    }

    // This method gets called when the view first loads, and also whenever the
    // view changes. Use this opportunity to save the view's …

我正在尝试将 a 嵌入RecyclerView自定义视图 (a RefreshableList)的正文中。

这是我的项目结构：它包含 2 个模块，app和rlist。

所述RLIST模块保持（自定义视图RefreshableList），其中我要嵌入RecyclerView。

RefreshableList.java（自定义视图）

public class RefreshableList extends RelativeLayout {

    private RecyclerView mRecyclerView;

    private Context mContext;
    private MyAdapter mAdapter;

    public RefreshableList(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        Log.i("ADAPTER", "RefreshableList is initializing views...");

        setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.refreshable_list, null);

        findViewsById(view);
        setupRecyclerView();
    }

    private void findViewsById(View view) {
        mRecyclerView = (RecyclerView) …

我正在尝试了解Android如何衡量和展示观点.我创建了一个包含自定义视图和视图组的示例应用.

CustomViewGroup

public class CustomViewGroup extends ViewGroup {

    private static final String LOG_TAG = "CustomViewGroup";

    public CustomViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Log.d(LOG_TAG, String.format(Locale.ENGLISH,
                getTag() + " " +
                        "onMeasure(widthMeasureSpec=%d, heightMeasureSpec%d)",
                widthMeasureSpec, heightMeasureSpec
        ));

        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != View.GONE) {
                // Make or work out measurements for children here …

PasscodeView我的对话框片段布局中有一个自定义视图。

密码视图.java：

public class PasscodeView extends ViewGroup {

    EditText mEditText;
    int mDigitCount;

    private int mDigitWidth;
    private int mDigitRadius;
    private int mOuterStrokeWidth;
    private int mInnerStrokeWidth;
    private int mDigitInnerRadius;
    private int mDigitSpacing;
    private int mDigitElevation;

    private int mControlColor;
    private int mHighlightedColor;
    private int mInnerColor;
    private int mInnerBorderColor;

    private OnFocusChangeListener mOnFocusChangeListener;
    private PasscodeEntryListener mPasscodeEntryListener;

    public PasscodeView(Context context) {
        this(context, null);
    }

    public PasscodeView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public PasscodeView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr); …

尝试在我的应用程序中创建自定义 SurfaceView 视图时出现错误。

<com.example.test.CustomSurfaceView
    android:id="@+id/cameraPreview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

这是课程：

package com.example.test;
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.util.List;
public class CustomSurfaceView extends SurfaceView implements SurfaceHolder.Callback {

private static final String TAG = "CameraPreview";

private Context mContext;
private SurfaceHolder mHolder;
private Camera mCamera;
private List<Camera.Size> mSupportedPreviewSizes;
private Camera.Size mPreviewSize;

public CustomSurfaceView(Context context, Context mContext) {
    super(context);
    this.mContext = mContext;
}

public CustomSurfaceView(Context context, Camera camera) {
    super(context);
    mContext = context;
    mCamera = camera;

    // supported preview sizes …

我做了一个自定义布局，想要为实现RadioButton。android类的代码在这里：

public class MyRadioButton extends LinearLayout implements View.OnClickListener{
    private ImageView iv;
    private TextView tv;
    private RadioButton rb;

    private View view;

    public MyRadioButton(Context context) {
        super(context);
        view = View.inflate(context, R.layout.my_radio_button, this);
        setOrientation(HORIZONTAL);

        rb = (RadioButton) view.findViewById(R.id.radioButton1);
        tv = (TextView) view.findViewById(R.id.textView1);
        iv = (ImageView) view.findViewById(R.id.imageView1);

        view.setOnClickListener(this);
        rb.setOnCheckedChangeListener(null);
    }

    public void setImageBitmap(Bitmap bitmap) {
        iv.setImageBitmap(bitmap);
    }

    public View getView() {
        return view;
    }

    @Override
    public void onClick(View v) {

        boolean nextState = !rb.isChecked();

        LinearLayout lGroup = (LinearLayout)view.getParent();
        if(lGroup != null){
            int …