看看几个Paint方法：

getTextBounds()和

measureText.我们可以使用它们来确定TextView中文本的偏移量.确定TextView中的偏移后,我们可以将其添加到TextView本身的位置,以确定文本的屏幕坐标(如果需要).

以下示例在三个TextView中查找文本的边界,并在文本周围绘制一个矩形.矩形包含TextView中文本的(x,y)坐标.

activity_main.xml中

一个简单的演示布局.

android:id="@+id/layout"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="24dp"

android:background="@android:color/holo_blue_light"

android:padding="24dp"

android:text="Hello World"

android:textColor="@android:color/black"

android:textSize="50sp"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="24dp"

android:background="@android:color/holo_blue_light"

android:padding="24dp"

android:text="Hello Worldly"

android:textColor="@android:color/black"

android:textSize="50sp"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView1" />

android:id="@+id/textView3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="24dp"

android:background="@android:color/holo_blue_light"

android:padding="24dp"

android:text="aaaaaaaaaa"

android:textColor="@android:color/black"

android:textSize="50sp"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toBottomOf="@id/textView2" />

MainActivity.java

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

drawTextBounds((TextView) findViewById(R.id.textView1));

drawTextBounds((TextView) findViewById(R.id.textView2));

drawTextBounds((TextView) findViewById(R.id.textView3));

}

private void drawTextBounds(TextView textView) {

// Force measure of text pre-layout.

textView.measure(0,0);

String s = (String) textView.getText();

// bounds will store the rectangle that will circumscribe the text.

Rect bounds = new Rect();

Paint textPaint = textView.getPaint();

// Get the bounds for the text. Top and bottom are measured from the baseline. Left

// and right are measured from 0.

textPaint.getTextBounds(s,s.length(),bounds);

int baseline = textView.getBaseline();

bounds.top = baseline + bounds.top;

bounds.bottom = baseline + bounds.bottom;

int startPadding = textView.getPaddingStart();

bounds.left += startPadding;

// textPaint.getTextBounds() has already computed a value for the width of the text,// however,Paint#measureText() gives a more accurate value.

bounds.right = (int) textPaint.measureText(s,s.length()) + startPadding;

// At this point,(x,y) of the text within the TextView is (bounds.left,bounds.top)

// Draw the bounding rectangle.

Bitmap bitmap = Bitmap.createBitmap(textView.getMeasuredWidth(),textView.getMeasuredHeight(),Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(bitmap);

Paint rectPaint = new Paint();

rectPaint.setColor(Color.RED);

rectPaint.setStyle(Paint.Style.STROKE);

rectPaint.setStrokeWidth(1);

canvas.drawRect(bounds,rectPaint);

textView.setForeground(new BitmapDrawable(getResources(),bitmap));

}

}