Android消息提示框Toast
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:![](//img-blog.csdn.net/20130623215830093?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2F4eDcxNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
![](//img-blog.csdn.net/20130623215835906?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2F4eDcxNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
![](//img-blog.csdn.net/20130623215842750?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2F4eDcxNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center)
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();
- @Override
- protected 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);
- }
- @Override
- public 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() {
- @Override
- public void run() {
- Toast.makeText(MainActivity.this, "我来自其他线程", Toast.LENGTH_LONG)
- .show();
- }
- });
- }
- }