Android消息提示框Toast
16lz
2021-01-23
Android消息提示框Toast
Toast是Android中一种简易的消息提示框。和Dialog不一样的是,Toast是没有焦点的,toast提示框不能被用户点击,而且Toast显示的时间有限,toast会根据用户设置的显示时间后自动消失。
创建Toast的方法总共有2种:
1.Toast.makeText(Context context, (CharSequence text)/( int resId), int duration)
参数:context是指上下文对象,通常是当前的Activity,text是指自己写的消息内容,resId指显示内容引用Resource的那条数据,duration指Toast的显示时间,Toast默认有LENGTH_SHORT和LENGTH_LONG两常量,分别表示时间长和短,也可以自定义时间,如:5000表示显示5秒。用此方法获得Toast对象之后调用.show()方法即可显示消息。
2.自定义Toast,通过Toast toast = new Toast(Context context)获得Toast对象,调用.show()方法即可显示消息。
toast.setDuration(duration)设置显示时间,
toast.setGravity(gravity, xOffset, yOffset)设置显示位置,三个参数分别表示(起点位置,水平位移,垂直位移),
toast.setMargin(float horizontalMargin, float verticalMargin)以横向和纵向的百分比设置显示位置,参数均为float类型(水平位移正右负左,竖直位移正上负下),
toast.setText(text)设置消息内容,
toast.setView(view)设置Toast显示的视图组件。
实例:
main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:orientation="vertical" android:padding="10dp" ><Button android:id="@+id/simpleToast" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="默认" ></Button> <Button android:id="@+id/simpleToastWithCustomPosition" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="自定义显示位置" ></Button> <Button android:id="@+id/imageToast" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="带图片" ></Button> <Button android:id="@+id/customToast" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="完全自定义" ></Button> <Button android:id="@+id/runToastFromOtherThread" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="其他线程" ></Button></LinearLayout>
custom.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/toastLayout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" ><TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="1dp" android:background="#333399" android:gravity="center" android:text="ToastTitle" android:textColor="#ffffff" /> <LinearLayout android:id="@+id/toastContent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="1dp" android:layout_marginLeft="1dp" android:layout_marginRight="1dp" android:background="#3366ff" android:orientation="vertical" android:padding="15dp" > <ImageView android:id="@+id/customImageToast" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" /> <TextView android:id="@+id/customTextToast" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:paddingLeft="10dp" android:paddingRight="10dp" /></LinearLayout></LinearLayout>
MainActivity.java
public class MainActivity extends Activity implements OnClickListener { private Button simpleToastBtn, simpleToastWithCustomPositionBtn,imageToastBtn, customToastBtn, runToastFromOtherThreadBtn;Handler handler = new Handler(); @Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);setContentView(R.layout.main);simpleToastBtn = (Button) findViewById(R.id.simpleToast);simpleToastWithCustomPositionBtn = (Button) findViewById(R.id.simpleToastWithCustomPosition);imageToastBtn = (Button) findViewById(R.id.imageToast);customToastBtn = (Button) findViewById(R.id.customToast);runToastFromOtherThreadBtn = (Button) findViewById(R.id.runToastFromOtherThread); simpleToastBtn.setOnClickListener(this);simpleToastWithCustomPositionBtn.setOnClickListener(this);imageToastBtn.setOnClickListener(this);customToastBtn.setOnClickListener(this);runToastFromOtherThreadBtn.setOnClickListener(this);} @Overridepublic void onClick(View v) { Toast toast = null;switch (v.getId()) { case R.id.simpleToast:Toast.makeText(MainActivity.this, "默认Toast样式", Toast.LENGTH_LONG).show();break; case R.id.simpleToastWithCustomPosition:toast = Toast.makeText(MainActivity.this, "自定义位置Toast",Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, 0, 0);toast.show();break; case R.id.imageToast:toast = Toast.makeText(MainActivity.this, "带图片的Toast",Toast.LENGTH_LONG);LinearLayout layout = (LinearLayout) toast.getView();ImageView image = new ImageView(MainActivity.this);image.setImageResource(R.drawable.ic_launcher);layout.addView(image, 0);toast.show();break; case R.id.customToast:LayoutInflater inflater = getLayoutInflater();View view = inflater.inflate(R.layout.custom, null); ImageView customImage = (ImageView) view.findViewById(R.id.customImageToast);TextView customText = (TextView) view.findViewById(R.id.customTextToast);customImage.setImageResource(R.drawable.ic_launcher);customText.setText("完全自定义Toast"); toast = new Toast(MainActivity.this);toast.setGravity(Gravity.RIGHT | Gravity.TOP, 30, 30);toast.setDuration(Toast.LENGTH_LONG);toast.setView(view);toast.show();break; case R.id.runToastFromOtherThread:new Thread(new Runnable() { public void run() { showToast();}}).start();break;}} public void showToast() { handler.post(new Runnable() { @Overridepublic void run() { Toast.makeText(MainActivity.this, "我来自其他线程", Toast.LENGTH_LONG).show();}});}}
作者:王韶刚
原文地址:https://blog.csdn.net/qq_41853555/article/details/106132822
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