使提示框居中显示&自定义提示框

ToastActivity.java文件：

public class ToastActivity extends AppCompatActivity {
    private Button mbtnToast1,mbtnToast2,mbtnToast3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_toast);
        mbtnToast1=findViewById(R.id.btn_toast1);
        mbtnToast2=findViewById(R.id.btn_toast2);
        mbtnToast3=findViewById(R.id.btn_toast3);
        OnClick onClick=new OnClick();
        mbtnToast1.setOnClickListener(onClick);
        mbtnToast2.setOnClickListener(onClick);
        mbtnToast3.setOnClickListener(onClick);
    }

    class OnClick implements View.OnClickListener{

        @Override
        public void onClick(View view) {
            switch (view.getId()){
                case R.id.btn_toast1:
                    Toast.makeText(getApplicationContext(), "点击一", Toast.LENGTH_SHORT).show();
                    break;
                case R.id.btn_toast2:
                    Toast toastCenter=Toast.makeText(getApplicationContext(),"点击二居中显示",Toast.LENGTH_SHORT);
                    toastCenter.setGravity(Gravity.CENTER,0,0);
                    toastCenter.show();
                    break;//使提示框居中显示
                case R.id.btn_toast3:
                    Toast toastCustom=new Toast(getApplicationContext());
                    LayoutInflater inflater=LayoutInflater.from(ToastActivity.this);
                    View view1 = inflater.inflate(R.layout.layout_toast, null);
                    ImageView imageView=view1.findViewById(R.id.iv_toast);
                    TextView textView=view1.findViewById(R.id.tv_toast);
                    imageView.setImageResource(R.drawable.zidingyi);
                    textView.setText("点击三自定义提示框出现");
                    toastCustom.setView(view1);
                    toastCustom.setDuration(Toast.LENGTH_SHORT);
                    toastCustom.show();
                    break;
            }
        }
    }
}

然后对应activity_toast.xml文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_toast1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="默认"/>

    <Button
        android:id="@+id/btn_toast2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="改变提示框出现位置"/>

    <Button
        android:id="@+id/btn_toast3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="自定义（带图片）"/>

</LinearLayout>

还有一个layout_toast.xml文件来定义自定义提示框：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@color/greydrak"
    android:layout_gravity="center">
    <ImageView
        android:id="@+id/iv_toast"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:scaleType="fitCenter"
        android:layout_gravity="center"/>

    <TextView
        android:id="@+id/tv_toast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:textColor="@color/white"
        android:layout_marginTop="5dp"/>

</LinearLayout>