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📜  如何在Android中将可绘制的文本添加到ImageView?

📅  最后修改于: 2021-05-09 16:45:44             🧑  作者: Mango

在许多android应用程序中,您将看到一个功能,其中您可以看到在ImageView内显示一个简单的文本,或者可以看到一个文本以特定的图像或形状显示。通常,这种视图类型是在Android设备上提供的“联系人”应用程序中看到的。在该应用程序中,您将在圆形图像视图中看到每个联系人姓名的首字母。在本文中,我们将研究在我们的Android应用程序中创建相同类型的视图。

我们将在本文中构建什么?

我们将构建一个简单的应用程序,在该应用程序中,我们将使用可绘制的文本在Android的图像视图中显示一个简单的文本。我们将以不同的形状显示文本。下面是屏幕快照,在其中我们将看到我们将要构建的内容。

在Android中将可绘制的文本添加到ImageView

分步实施

步骤1:创建一个新项目

要在Android Studio中创建新项目,请参阅如何在Android Studio中创建/启动新项目。请注意,选择Java作为编程语言。

步骤2:添加依赖项和JitPack存储库

导航到Gradle脚本> build.gradle(Module:app)并将以下依赖项添加到“依赖项”部分。

将JitPack存储库添加到您的构建文件中。将其添加到allprojects {}部分中存储库末尾的根build.gradle中。

添加此依赖项后,同步您的项目,现在我们将继续执行它。

步骤3:使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml,然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

XML


  
    
    
  
        
        
  
            
            
              
            
            
  
        
          
        
              
            
            
              
            
            
  
        
  
        
              
            
            
              
            
            
              
        
          
    
      


Java
import android.os.Bundle;
import android.widget.ImageView;
  
import androidx.appcompat.app.AppCompatActivity;
  
import com.amulyakhare.textdrawable.TextDrawable;
  
public class MainActivity extends AppCompatActivity {
      
    // creating a variable for image view.
    private ImageView tileIV, borderIV, circleIV;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
        // on below line we are initializing our image view
        tileIV = findViewById(R.id.idIVTile);
        borderIV = findViewById(R.id.idIVBorder);
        circleIV = findViewById(R.id.idIVCircle);
  
        // on below line we are creating a new text drawable
        TextDrawable tileImg = TextDrawable.builder()
                // begin config method is use to start the config.
                .beginConfig()
                // on below line we are setting width and height for our drawable.
                .width(130)  // width in px
                .height(130) // height in px
                // on below line we are ending the config.
                .endConfig()
                // as we are building a rectangle we are using 
                // a build rect method to create a new rectangle
                // and inside that we are passing the text 
                // as G and color for the drawable.
                .buildRect("G", getResources().getColor(R.color.purple_200));
        tileIV.setImageDrawable(tileImg);
          
        // below text drawable is for round rectangle
        TextDrawable roundRect = TextDrawable.builder().beginConfig()
                .width(130)  // width in px
                .height(130) // height in px
                .endConfig()
                // as we are building a rectangle with round corners we are calling a build round rect method
                // in that method we are passing the text, color and radius for our radius.
                .buildRoundRect("G", getResources().getColor(R.color.purple_200), 10); // radius in px
        borderIV.setImageDrawable(roundRect);
          
        // below text drawable is a circular.
        TextDrawable drawable2 = TextDrawable.builder().beginConfig()
                .width(130)  // width in px
                .height(130) // height in px
                .endConfig()
                // as we are building a circular drawable we
                // are calling a build round method.
                // in that method we are passing our text and color.
                .buildRound("F", getResources().getColor(R.color.purple_200));
        circleIV.setImageDrawable(drawable2);
    }
}


步骤4:使用MainActivity。 Java文件

转到MainActivity。 Java文件并参考以下代码。下面是MainActivity的代码。 Java文件。在代码内部添加了注释,以更详细地了解代码。

Java

import android.os.Bundle;
import android.widget.ImageView;
  
import androidx.appcompat.app.AppCompatActivity;
  
import com.amulyakhare.textdrawable.TextDrawable;
  
public class MainActivity extends AppCompatActivity {
      
    // creating a variable for image view.
    private ImageView tileIV, borderIV, circleIV;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
        // on below line we are initializing our image view
        tileIV = findViewById(R.id.idIVTile);
        borderIV = findViewById(R.id.idIVBorder);
        circleIV = findViewById(R.id.idIVCircle);
  
        // on below line we are creating a new text drawable
        TextDrawable tileImg = TextDrawable.builder()
                // begin config method is use to start the config.
                .beginConfig()
                // on below line we are setting width and height for our drawable.
                .width(130)  // width in px
                .height(130) // height in px
                // on below line we are ending the config.
                .endConfig()
                // as we are building a rectangle we are using 
                // a build rect method to create a new rectangle
                // and inside that we are passing the text 
                // as G and color for the drawable.
                .buildRect("G", getResources().getColor(R.color.purple_200));
        tileIV.setImageDrawable(tileImg);
          
        // below text drawable is for round rectangle
        TextDrawable roundRect = TextDrawable.builder().beginConfig()
                .width(130)  // width in px
                .height(130) // height in px
                .endConfig()
                // as we are building a rectangle with round corners we are calling a build round rect method
                // in that method we are passing the text, color and radius for our radius.
                .buildRoundRect("G", getResources().getColor(R.color.purple_200), 10); // radius in px
        borderIV.setImageDrawable(roundRect);
          
        // below text drawable is a circular.
        TextDrawable drawable2 = TextDrawable.builder().beginConfig()
                .width(130)  // width in px
                .height(130) // height in px
                .endConfig()
                // as we are building a circular drawable we
                // are calling a build round method.
                // in that method we are passing our text and color.
                .buildRound("F", getResources().getColor(R.color.purple_200));
        circleIV.setImageDrawable(drawable2);
    }
}

现在运行您的应用程序,并查看该应用程序的输出。

输出:

在Android中将可绘制的文本添加到ImageView