android的toast
① Android开发,弹出提示框“Toast”是什么问题
Android开发,弹出提示框“Toast”是因为输入了下面这句操作命令:
Toast.makeText(getApplicationContext(),"你的提示内容",Toast.LENGTH_SHORT).show();
Android开发操作如下:
先导入:
import android.widget.Toast;
关键代码:
Toast.makeText(getApplicationContext(),"提示内容",Toast.LENGTH_SHORT).show();
例子:
在一个activity中,只有一个button,单击这个button弹出“单击完成”提示框。
提示:
只需在onCreante方法中添加button的单击事件
完整代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_toast1);
//设置button的单击事件
findViewById(R.id.btnToast).setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
//弹出提示框
Toast.makeText(getApplicationContext(),"单击完成",Toast.LENGTH_SHORT).show();
}
});
}
② 如何在Android开发中熟练使用五种Toast的特效
Toast是Android中用来显示显示信息的一种机制,和Dialog不一样的是,Toast是没有焦点的,而且Toast显示的时间有限,过一定的时间就会自动消失。默认效果,代码为:
Toast.makeText(getApplicationContext(), "默认Toast样式", Toast.LENGTH_SHORT).show();
自定义显示位置效果,代码为:
toast = Toast.makeText(getApplicationContext(), "自定义位置Toast", Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER, 0, 0); toast.show();
带图片效果,代码为:
toast = Toast.makeText(getApplicationContext(), "带图片的Toast", Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER, 0, 0); LinearLayout toastView = (LinearLayout) toast.getView(); ImageView imageCodeProject = new ImageView(getApplicationContext()); imageCodeProject.setImageResource(R.drawable.icon); toastView.addView(imageCodeProject, 0); toast.show();
完全自定义效果,代码为:
LayoutInflater inflater = getLayoutInflater(); View layout = inflater.inflate(R.layout.custom, (ViewGroup) findViewById(R.id.llToast)); ImageView image = (ImageView) layout .findViewById(R.id.tvImageToast); image.setImageResource(R.drawable.icon); TextView title = (TextView) layout.findViewById(R.id.tvTitleToast); title.setText("Attention"); TextView text = (TextView) layout.findViewById(R.id.tvTextToast); text.setText("完全自定义Toast"); toast = new Toast(getApplicationContext()); toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40); toast.setDuration(Toast.LENGTH_LONG); toast.setView(layout); toast.show();
其他线程,代码为:
new Thread(new Runnable() { public void run() { showToast(); } }).start();