Toast

• Toast是一个消息提示组件
• 设置显示的位置
• 自定义显示内容（添加一个图片）
• 简单封装

ToastActivity

public class ToastActivity extends AppCompatActivity {

    private Button mBtnToast1, mBtnToast2, mBtnToast3, mBtnToast4;

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

        mBtnToast1 = findViewById(R.id.btn_toast_1);
        mBtnToast2 = findViewById(R.id.btn_toast_2);
        mBtnToast3 = findViewById(R.id.btn_toast_3);
        mBtnToast4 = findViewById(R.id.btn_toast_4);

        OnClick onClick = new OnClick();
        mBtnToast1.setOnClickListener(onClick);
        mBtnToast2.setOnClickListener(onClick);
        mBtnToast3.setOnClickListener(onClick);
        mBtnToast4.setOnClickListener(onClick);
    }

    class OnClick implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btn_toast_1:
                    Toast.makeText(ToastActivity.this, "Toast", Toast.LENGTH_LONG).show();
                    break;
                case R.id.btn_toast_2:
                    Toast toastCenter = Toast.makeText(ToastActivity.this, "居中Toast", Toast.LENGTH_LONG);
                    toastCenter.setGravity(Gravity.CENTER, 0, 0);
                    toastCenter.show();
                    break;
                case R.id.btn_toast_3:

                    Toast toastCustom = new Toast(getApplicationContext());
                    LayoutInflater inflater = LayoutInflater.from(ToastActivity.this);
                    View view = inflater.inflate(R.layout.layout_toast, null);
                    ImageView imageView = view.findViewById(R.id.iv_toast);
                    TextView textView = view.findViewById(R.id.tv_toast);
                    imageView.setImageResource(R.drawable.arrowdown);
                    textView.setText("自定义Toast");
                    toastCustom.setView(view);
                    toastCustom.show();
                    toastCustom.setDuration(Toast.LENGTH_LONG);
                    break;

                case R.id.btn_toast_4:
                    ToastUtil.showMessage(getApplicationContext(), "包装过的msg");
                    break;

            }
        }
    }
}

自定义ToastView

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#99000000"
    android:gravity="center"
    >

    <LinearLayout
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:orientation="vertical"
        android:gravity="center"
        >
        <ImageView
            android:id="@+id/iv_toast"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:scaleType="fitCenter"/>

        <TextView
            android:id="@+id/tv_toast"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:textColor="@color/colorWhite"
            android:layout_marginTop="20dp"/>

    </LinearLayout>

</LinearLayout>

封装Toast工具类

public class ToastUtil {
    public static Toast mToast;
    public static void showMessage(Context context, String msg) {
        if (mToast == null) {
            mToast = Toast.makeText(context, msg, Toast.LENGTH_LONG);
        } else  {
            mToast.setText(msg);
        }
        mToast.show();
    }
}