Android重寫TextView實現文字整齊排版的方法(附demo源碼下載)

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

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

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

<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。

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希望本文所述對大家Android程序設計有所幫助。