public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private EditText textView;
private ImageView imageView;
private Button btn;
private String content;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

textView = (EditText) findViewById(R.id.input_text);
imageView = (ImageView) findViewById(R.id.input_image);
imageView.setVisibility(View.INVISIBLE);
btn = (Button) findViewById(R.id.btn_close);
btn.setOnClickListener(this);
//

}

public static Bitmap textAsBitmap(String text, float textSize) {

TextPaint textPaint = new TextPaint();

// textPaint.setARGB(0x31, 0x31, 0x31, 0);
textPaint.setColor(Color.BLACK);
textPaint.setAntiAlias(true);
textPaint.setTextSize(textSize);

StaticLayout layout = new StaticLayout(text, textPaint, 450,
Layout.Alignment.ALIGN_NORMAL, 1.3f, 0.0f, true);
Bitmap bitmap = Bitmap.createBitmap(layout.getWidth() + 20,
layout.getHeight() + 20, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.translate(10, 10);
// canvas.drawColor(Color.GRAY);
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);//绘制透明色
layout.draw(canvas);
Log.d("textAsBitmap",
String.format("1:%d %d", layout.getWidth(), layout.getHeight()));
return bitmap;
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_close:
content = textView.getText().toString().trim();
if (content != null && content != "") {
Bitmap bitmap = textAsBitmap(content, 28);
imageView.setVisibility(View.VISIBLE);
imageView.setBackgroundResource(R.mipmap.liaotian);
imageView.setImageBitmap(bitmap);
}else{
Toast.makeText(MainActivity.this,"输入内容不能为空",Toast.LENGTH_SHORT);
}
}
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.admin.enjoytalk.MainActivity">

<TextView

android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />

<!--<android.support.v7.widget.RecyclerView-->
<!--android:layout_centerInParent="true"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content"-->
<!--/>-->
<EditText
android:id="@+id/input_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btn_close"
android:layout_width="match_parent"
android:text="输入完成"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/input_image"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

public StaticLayout(CharSequence source,
   TextPaint paint,
   int width,
   Layout.Alignment align,
   float spacingmult,
   float spacingadd,
   boolean includepad)
   
public StaticLayout(CharSequence source,
   int bufstart,
   int bufend,
   TextPaint paint,
   int outerwidth,
   Layout.Alignment align,
   float spacingmult,
   float spacingadd,
   boolean includepad)
   
public StaticLayout(CharSequence source,
   int bufstart,
   int bufend,
   TextPaint paint,
   int outerwidth,
   Layout.Alignment align,
   float spacingmult,
   float spacingadd,
   boolean includepad,
   TextUtils.TruncateAt ellipsize,
   int ellipsizedWidth)

StaticLayout(CharSequence source, int bufstart, int bufend,
  TextPaint paint, int outerwidth,
  Alignment align,
  float spacingmult, float spacingadd,
  boolean includepad,
  TextUtils.TruncateAt ellipsize, int ellipsizedWidth)