本文實例講述了Android重寫TextView實現文字整齊排版的方法。分享給大家供大家參考，具體如下：
XRTextView類
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package rong.android.test;import org.json.JSONArray;import org.json.JSONException;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;import android.widget.TextView;public class XRTextView extends TextView{ private final String namespace = "rong.android.TextView"; private String text; private float textSize; private float paddingLeft; private float paddingRight; private float marginLeft; private float marginRight; private int textColor; private JSONArray colorIndex; private Paint paint1 = new Paint(); private Paint paintColor = new Paint(); private float textShowWidth; private float Spacing = 0; private float LineSpacing = 1.3f;//行與行的間距 public XRTextView(Context context, AttributeSet attrs) { super(context, attrs); text = attrs.getAttributeValue( "http://schemas.android.com/apk/res/android", "text"); textSize = attrs.getAttributeIntValue(namespace, "textSize", 25);//字體大小 textColor = attrs.getAttributeIntValue(namespace, "textColor",Color.BLUE);//字體顏色 paddingLeft = attrs.getAttributeIntValue(namespace, "paddingLeft", 0); paddingRight = attrs.getAttributeIntValue(namespace, "paddingRight", 0); marginLeft = attrs.getAttributeIntValue(namespace, "marginLeft", 0); marginRight = attrs.getAttributeIntValue(namespace, "marginRight", 0); paint1.setTextSize(textSize); paint1.setColor(textColor); paint1.setAntiAlias(true); paintColor.setAntiAlias(true); paintColor.setTextSize(textSize); paintColor.setColor(Color.BLUE); } public XRTextView(Context context, float textSize, int textColor, float paddingLeft, float paddingRight, float marginLeft, float marginRight){ super(context); this.textSize = textSize; this.textColor = textColor; this.paddingLeft = paddingLeft; this.paddingRight = paddingRight; this.marginLeft = marginLeft; this.marginRight = marginRight; paint1.setTextSize(textSize); paint1.setColor(textColor); paint1.setAntiAlias(true); paintColor.setAntiAlias(true); paintColor.setTextSize(textSize); paintColor.setColor(Color.BLUE); } public JSONArray getColorIndex() { return colorIndex; } public void setColorIndex(JSONArray colorIndex) { this.colorIndex = colorIndex; } /** * 傳入一個索引，判斷當前字是否被高亮 * @param index * @return * @throws JSONException */ public boolean isColor(int index) throws JSONException{ if(colorIndex == null){ return false; } for(int i = 0 ; i < colorIndex.length() ; i ++){ JSONArray array = colorIndex.getJSONArray(i); int start = array.getInt(0); int end = array.getInt(1)-1; if(index >= start && index <= end){ return true; } } return false; } @Override protected void onDraw(Canvas canvas) {// super.onDraw(canvas); View view=(View)this.getParent(); textShowWidth=view.getMeasuredWidth()-paddingLeft - paddingRight - marginLeft - marginRight; int lineCount = 0; text = this.getText().toString();//.replaceAll("\n", "\r\n"); if(text==null)return; char[] textCharArray = text.toCharArray(); // 已繪的寬度 float drawedWidth = 0; float charWidth; for (int i = 0; i < textCharArray.length; i++) { charWidth = paint1.measureText(textCharArray, i, 1); if(textCharArray[i]=='\n'){ lineCount++; drawedWidth = 0; continue; } if (textShowWidth - drawedWidth < charWidth) { lineCount++; drawedWidth = 0; } boolean color = false; try { color = isColor(i); } catch (JSONException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } if(color){ canvas.drawText(textCharArray, i, 1, paddingLeft + drawedWidth, (lineCount + 1) * textSize * LineSpacing, paintColor); }else{ canvas.drawText(textCharArray, i, 1, paddingLeft + drawedWidth, (lineCount + 1) * textSize * LineSpacing, paint1); } if(textCharArray[i] > 127 && textCharArray[i] != '、' && textCharArray[i] != '，' && textCharArray[i] != '。' && textCharArray[i] != '：' && textCharArray[i] != '！'){ drawedWidth += charWidth + Spacing; }else{ drawedWidth += charWidth; } } setHeight((int) ((lineCount + 1) * (int) textSize * LineSpacing + 10)); } public float getSpacing() { return Spacing; } public void setSpacing(float spacing) { Spacing = spacing; } public float getMYLineSpacing() { return LineSpacing; } public void setMYLineSpacing(float lineSpacing) { LineSpacing = lineSpacing; } public float getMYTextSize() { return textSize; } public void setMYTextSize(float textSize) { this.textSize = textSize; paint1.setTextSize(textSize); paintColor.setTextSize(textSize); }} |
MainActivity類
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package rong.android.test;import android.os.Bundle;import android.widget.TextView;import android.app.Activity;public class MainActivity extends Activity { private XRTextView xrtextview = null; private TextView textview = null; private String content = "abcdefgABCDEF我要你lfwjkdfl;skjf asljkflskjfls;kjfsljfwfisdlfjsllkjsdfjlskjf546132s1f3sd4f31s3dffslfksjdfljlsadkjflsajdf sdfjklsajdflsa;jdfls 的!@#$%^&*()_"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); xrtextview = (XRTextView) this.findViewById(R.id.mytextview_tv); xrtextview.setText(content); textview = (TextView) this.findViewById(R.id.mytextview_tv1); textview.setText(content); }} |
布局文件
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<LinearLayout 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" android:orientation="vertical" > <rong.android.test.XRTextView android:id="@+id/mytextview_tv" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/mytextview_tv1" android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="@android:color/black" /></LinearLayout> |
完整實例代碼點擊此處本站下載。
希望本文所述對大家Android程序設計有所幫助。
