渐进演示如何使用 Toast。
图 1 左：主程序；中：点击“默认 Toast”；右：点击“自定义位置 Toast”
图 2 左：点击“带图片 Toast”；中：点击“自定义 Toast”；右：“来自其他线程 Toast”
main.xml 文件，只是六个按钮；Toast 也可以将 custom.xml 文件作为信息提示，具体下载 Demo，此处略，核心代码瑞安所示：
package com.example.toastdemo.activity; import com.example.toastdemo.R; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { Handler handler = new Handler(); Toast toast = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); findViewById(R.id.btnSimpleToast).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getApplicationContext(), "默认Toast", Toast.LENGTH_SHORT).show(); } }); findViewById(R.id.btnSimpleToastWithCustomPosition).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { toast = Toast.makeText(getApplicationContext(), "自定义位置Toast", Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } }); findViewById(R.id.btnSimpleToastWithImage).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { toast = Toast.makeText(getApplicationContext(), "带图片Toast", Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER, 0, 0); LinearLayout toastView = (LinearLayout) toast.getView(); ImageView image1 = new ImageView( getApplicationContext()); image1.setImageResource(R.drawable.icon); toastView.addView(image1, 0); toast.show(); } }); findViewById(R.id.btnCustomToast).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { LayoutInflater inflater = getLayoutInflater(); View layout = inflater.inflate(R.layout.custom, (ViewGroup) findViewById(R.id.llToast)); ImageView image2 = (ImageView) layout .findViewById(R.id.tvImageToast); image2.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("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(); } }); findViewById(R.id.btnRunToastFromOtherThread).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { new Thread(new Runnable() { public void run() { showToast(); } }).start(); } }); } public void showToast() { handler.post(new Runnable() { @Override public void run() { Toast.makeText(getApplicationContext(), "来自其他线程Toast", Toast.LENGTH_SHORT).show(); } }); } }
下载 Demo
转载于:https://www.cnblogs.com/liuning8023/p/3798338.html
